O-hydroxyphenyl-s-triazines

ABSTRACT

Novel o-hydroxyphenyl-s-triazines are substantially non-coloring light stabilizers for organic polymeric substrata and are sufficiently stable to withstand temperatures up to at least 200*C.

United States Patent Helmo et a]. July 22, 1975 O-HYDROXYPHENYL-S-TRIAZINES [5 1] Int. Cl t. C07d 55/18 [75] Inventors: Brunetti Helmo, Riehen; Peterli [58] meld Search 260/248 2 6 33 Hans Jakob, Fullinsdorf, I Basel-Land; Hansjorg Heller, Riehen, all of Switzerland References cited [73] Assignee: Ciha-Geigy AG, Basel, Switzerland UNITED STATES PATENTS 3,270,0[6 8/1966 Duennenberger et al 260/248 [22] 1964 3,278,534 ll/l966 Schellenbaum et 6| 260/2495 2 H APPL 340 24 3,293,247 l2/l966 Duennenberger et al. 260/248 3,293,249 l2/l966 Billand et al i. 260/248 [30] Foreign Application Priority Data OTHER PUBLICATIONS Jan. 24. 1963 Switzerland 847/63 Karreri Organic chemislry- 4th English P Jan 2 1, i963 Switzerland... 843/63 E'Sevm (NY) Jan 24, 1963 Switzerland. 844/63 Jan. 24. 1963 Switzerland. .4 845/63 im y x min lohn D Randolph Jan. 24, 1963 Switzerland 846/63 [57] ABSTRACT [52] CL "260/2495l96/84;106/176; Novel o-hydroxyphenyl-striazines are substantially ll7/33.3; 117/1385; ll7/144; ll7/l45; 252/300; 252/401; 260/45.9 P; 260/45.9 R; 260/75 N; 260/78 R; 260/92.8 R; 260/93.5 R; 260/93.7; 260/94.9 R; 260/240 D; 260/248 C; 260/473 S; 260/564 R non-coloring light stabilizers for organic polymeric substrata and are sufficiently stable to withstand temperatures up to at least 200C.

4 Claims. No Drawings l O-I-IYDROXYPHENYL-S-TRIAZINES PART I The present invention, in a first aspect, concerns new o-hydroxyphenyl-s-triazines, a process for the production thereof, their use for the stabilization of certain light-sensitive organic materials and for the production of light filters, and, as industrial products, the organic materials stabilized with the aid of the new o-hydroxyphenyl-s-triazines, as well as light filters containing the same.

The absorptive power of a compound for light of a given wavelength is characterized by two expressions which are the absorptivity (a) and the molar extinction coefficient (6). These expressions are defined by the well-known equations:

c,,. is the concentration of the absorber in grams per liter of solution,

c represents the concentration of the absorber in moles per liter of solution,

d represents the thickness of the layer of the solution containing the absorber, in centimeters,

1,, represents the intensity of the incident light of the given wavelength,

1 represents the intensity of the light having passed the layer of solution containing the absorber.

The larger the values of a and e, the better does the compound absorb at the wavelength for which a and a hold.

2,4,G-Tris-aryl-triazines, including s-triazines which are substituted simultaneously in 2-,4-and o-position by phenyl or naphthyl radicals, are known. Those which bear at the phenyl or naphthyl radical a hydroxyl group in orthoposition to the linkage between the aromatic substituent and the triazinyl nucleus absorb ultraviolet light. However, at the concentrations needed to impart protection to the substrate against the effects of ultraviolet light, their light transmittance at 420 millimicrons (mu) is so much below the limit of 86% that they cause an excessive yellowish discoloration to all substrates containing them. This is particularly true of those striazines which contain o-hydroxy-naphthyl substituents, since they have a pronounced absorption in the range of 460 my. and higher.

Moreover, they are generally insoluble or poorly soluble in a number of non-polar polymeric substrates, requiring stabilization against the effects of ultraviolet light. Thus, they are not well compatible with such substrates as polyethylene, polypropylene or polyester resins based upon copolymers of styrene and/or methyl methacrylate with polyesters of unsaturated acids such as maleic acid. For commercial applications, these compounds are therefore of very limited practical usefulness.

On the other hand, Z-o-hydroxyphenyl-s-triazines which are bis-substituted in the 4- and fi-position by alkoxy or alkylamino groups are of such low inherent light fastness that they are useless as permanent lightstabilizing agents for organic polymeric materials.

Furthermore, while replacement of one aryl group at the benzophenone nucleus in the well-known hydroxy-benzophenone UV-absorbers by an alkoxy group leads to salicylic esters which are known to be commercially useful light-absorbing agents, which however, absorb at much shorter wavelength than the parent benzophenones, replacement of the aryl group by an alkyl affords compounds of such low inherent light fastness that these compounds are practically useless as light stabilizers.

lt has now been found that surprisingly and contrary to what would have been expected in view of the foregoing, valuable UV absorbers substantially free from the aforesaid drawbacks are obtained by reacting equimolar amounts of an amidine of the formula NH X-Cf (I) and of an amidine of the formula (NH (u) with an equimolar amount of an o-hydroxybenzene car boxylic acid ester of the formula in which formulas X and Y, independently of each other, represent hydrogen or an alkyl, alkenyl, cycloalkyl or aralkenyl group which may be substituted and R represents a hydrocarbon radical which may be substituted; and the benzene ring A can be further substituted in the 5 positions 3', 4' and/or 5' by halogen, alkyl, alkenyl or acyloxy groups or by cycloalkyl, aralkyl and aryl groups which may be substituted. in the Formulas I, ll and IV, the alkyl groups symbolized by X and Y have preferably l to l8 carbon atoms. Examples of such alkyl groups are the methyl, ethyl, propyl, isopropyl, butyl, tert. butyl, amyl, hexyl, octyl, decyl, dodecyl, tetradecyl, hexadecyl or octadecyl group; of these, alkyl groups having I to l0 carbon atoms are particularly preferred. The alkyl groups may be further substituted, in which case they may be defined by the formula -alkylene-E-D In this formula, "alkylene" represents a divalent aliphatic radical having 1 to 12, preferably l to 4 carbon atoms, and E represents either -O- or -S- or -N(D,)-. Each of D, and D,,

independently of each other, represents an alkyl radical preferably containing 1 to 8 carbon atoms and in the case of E being oxygen or nitrogen, D, and D: can also be hydrogen. Suitable groups of the formula -alkylene-E-D, are especially the w-hydroxyalkyl, w-alkoxyalkyl, w-alkylthioalkyl or w-aminoalkyl groups, such as, for example, the hydroxymethyl, Z-hydroxyethyl, 2-methoxyethyl, 2-ethoxyethyl, 2-butoxyethyl, 2-methylthioethyl, 2-butylthioethyl, 2-dodecylthioethyl, 2-N,N-dimethylaminoethyl, 2-N,N- diethylaminoethyl or the w-aminodecyl group.

Each of X and Y can also be a halogenoalkyl group preferably containing l to 4 carbon atoms such as the chloromethyl, bromomethyl, 2-chloroethyl or 4- chlorobutyl group.

As cycloalkyl groups, X or Y have 5 to 10, preferably however, 6 to 7 carbon atoms. Examples are the cyclohexyl, methylcyclohexyl or ethylcyclohexyl group.

As alkenyl group. X or Y represent groups of preferably 2 to l7 carbon atoms, e.g. the vinyl group, the A- or A -propcnyl or the A -heptadecenyl group, of which the alkenyl groups having 2 to 6 carbon atoms are especially preferred.

Each of X and Y can further be an alkenyl group substituted by aryl, especially a phenyl radical; X or Y as aralkenyl group contains 8 to l2, preferably 8 to 9 carbon atoms, examples being B-phenylvinyl (i.e. styryl) p-butylphenylvinyl, o-chlorophenylvinyl, m-methoxyphenylvinyl and B-phenyl-B-methylvinyl.

R in Formula III represents an alkyl radical which may be substituted, having 1 to l8, preferably 1 to 6 carbon atoms, eg the methyl, ethyl, methoxyethyl, ethoxyethyl, cyanomethyl or a carbalkoxyalkyl radical, particularly the methoxy-carbonyl-ethyl-, ethoxycarbonyl-ethyl and propoxy-carbonyl-ethyl radicals. In addition R represents a cycloalkyl radical having 5 to 10, preferably 6 to 7 carbon atoms, particularly the cyclohexyl radical, or an aralkyl radical containing 7 to l2 carbon atoms, especially the benzyl radical. Preferably, however, R represents a monocyclic aryl radical containing 6 to 12 and particularly 6 to 10 carbon atoms, such as the phenyl, methylphenyl or a halogenophenyl radical.

The benzene ring A in Formulas Ill and IV can be substituted by halogen, alkyl, alkenyl, acyloxy, cycloalkyl, aralkyl and/or aryl groups, among which the acyloxy radicals and also the cyclic radicals can be further substituted, e.g. by halogens such as chlorine or bromine. When alkyl groups are present as substituents of ring A they should contain 1 to 18, and preferably l to l carbon atoms, when alkenyl groups are present they should contain 2 to 18, and preferably 2 to carbon atoms; examples of these substituents are the methyl, tert. butyl or tert. octyl group or the allyl or methallyl group. Ring A can also contain as substituents cycloalkyl groups of 5 to 8 carbon atoms or aralkyl groups having 7 to carbon atoms, e.g. the cyclohexyl or the benzyl or l-phenylethyl group, or it can contain as substituents aryl groups, particularly those of the benzene series having 6 to 10 carbon atoms such as the phenyl, a methylphenyl, chlorophenyl or methoxyphenyl group. In the case in which ring A contains acyloxy groups the acyl radical thereof has from 1 to l8, preferably l to ID carbon atoms and can be derived from a straight or branched chain carboxylic acid being saturated or having at most one double bond. This carbacyl radical can be further substituted, particularly by carboxy, lower alkoxy-carbonyl or lower alkoxy groups of the aliphatic series. The acyl radical can also be derived from a cycloaliphatic carboxylic acid having 6 to l8 carbon atoms, an araliphatic carboxylic acid having 8 to 10 carbon atoms or from an aromatic carboxylic acid, in the latter case particularly from a benzene carboxylic acid having 7 to ll carbon atoms. It can also be a carbonic acid monoester radical having 2 to 11 carbon atoms. Examples are the acetic, propionic, stearic, acrylic, crotonic, B-carboxypropionic, B-carbomethoxypropionic, B-carbobutoxypropionic, B-carbohexoxypropionic, butoxyacetic, B-methoxypropionic, cyclohexane carboxylic, phenyl acetic, cinnamic, benzoic, chlorobenzoic, methylbenzoic, methoxybenzoic or o-carboxybenzoic acid radical, the carbomethoxy, carbethoxy, carbobutoxy, carbodecyloxy, carbocyclohexyloxy, carbobenzyloxy, carbophenyloxy, carbochlorophenloxy or carbocresyloxy radical.

The benzene ring A can contain one or more of these substituents as well as rings which can be fused thereto formed, e.g. by the tetramethylene group.

The term lower" as used in this specification and the appended claims in connection with an aliphatic radical means a radical having not more than 4 carbon atoms.

It has further been found that particularly satisfactory results are obtained with the compounds of the formula wherein each of R, and R, represents hydrogen,

alkyl of from I to 18 carbon atoms,

amino-alkyl of l to l2 carbon atoms,

hydroxy-alkyl of l to 12 carbon atoms,

alkoxy-alkyl wherein the alkoxy moiety has from 1 to 8 carbon atoms and the alkyl moiety has from 1 to 12 carbon atoms, polymer alkylthio-alkyl wherein the alkylthio moiety has from to 8 carbon atoms and the alkyl moiety has from 1 to l2 carbon atoms,

N-alkylamino-alkyl wherein the alkylamino moiety hasd from I to 8 carbon atoms and the alkyl moiety has from I to 12 carbon atoms,

N,N-di-(alkyl)-amino-alkyl wherein the N-alkyl groups have each from I to 8 carbon atoms, and

the alkyl moiety bearing the amino group has from I to 12 carbon atoms,

alkoxy-carbonyl-alkyl wherein the alkoxy moiety has from 1 to 8, and the alkyl moeity from l to l2 carbon atoms,

carboxy-alkyl with a total of from 2 to l3 carbon atoms,

chloro-alkyl of from 1 to 12 carbon atoms,

bromo-alkyl of from l to l2 carbon atoms,

cycloalkyl of from 5 to ID carbon atoms, 5 to 6 of which are ring members,

alkenyl of from 2 to 17 carbon atoms,

phenylalkenyl of from 8 to 12 carbon atoms,

alkyl-phenyl-alkenyl of from 9 to l2 carbon atoms, alkoxy-phenyl-alkenyl of from 9 to 12 carbon atoms,

chloroor bromo-phenyl-alkenyl of from 8 to 12 carbon atoms, and

R represents hydrogen,

chlorine,

bromine,

alkyl of from 1 to 18 carbon atoms,

alkenyl of from 2 to l8 carbon atoms,

cycloalkyl of from 5 to 8 carbon atoms, 5 to 6 of which are ring members,

phenylalkyl of from 7 to [0 carbon atoms,

alkylphenylalkyl of from 8 to 10 carbon atoms,

chloroor bromo-phenylalkyl of from 7 to 10 carbon atoms,

phenyl,

alkylpheny] of from 7 to 10 carbon atoms,

chlorophenyl,

bromophenyl, or one of the following radicals, referred to in this specification and defined in the appended claims by the term acyloxy:

alkanoyloxy of from I to l8 carbon atoms,

alkenoyloxy of from 3 to 18 carbon atoms and one double bond,

carboxy-alkanoyloxy of from 4 to 12 carbon atoms,

alkoxy-carbonyl-alkanoyloxy of from 3 to l3 carbon atoms,

carboxy-alkenoyloxy of from 4 to 12 carbon atoms,

alkoxy-carbonyl-alkenoyloxy of from 5 to l3 carbon atoms,

benzoyloxy, alkylbenzoyloxy of from 7 to l0 carbon atoms,

chloroor bromo-benzoyloxy,

alkoxy-carbonyloxy of from 2 to 13 carbon atoms,

cyclohexyloxycarbonyloxy,

benzyloxycarbonyloxy, or

phenoxycarbonyloxy.

The compounds of the formula V should preferably possess a molecular weight between 173 and 600. Compounds having good absorption and solubility properties have preferably a molecular weight between 405 and 460.

Some of the starting materials offormulas 1, ll and III are known and all others can be readily produced by methods known per se from known substances. Amidines of the formula I or II are obtained, for example, from nitriles of the formula XCN or Y-CN by conversion to corresponding iminoethers and reaction of the latter with ammonia; the o-hydroxybenzene carboxylic acid esters of formula III are obtained, for example, from the corresponding salicyclic acids by esterwith carbon dioxide according to Kolbe. The remarks regarding X, Y and A are also pertinent here.

The reaction to form the o-hydroxyphenyl triazines is performed by heating the starting materials I, ll and Ill, preferably in approximately equimolar ratios rations. Advantageously the reaction is performed in boiling organic solvents, particularly when amidines having a high melting point are used. Suitable solvents are mainly alcohols such as methanol, ethanol, ethylene glycol monomethyl or monoethyl ether, or also dioxan.

If desired, any reactive substituents present in the new o-hydroxyphenyl-s-triazines can subsequently be altered. For example, if X or Y is an alkoxyalkyl group then this can be converted with hydrobromic acid into the corresponding bromoalkyl group. oHydroxyphenyl-s-triazines having halogenoalkyl side groups are produced advantageously by this method. Exchangeable halogen can also be replaced by reaction with aqueous sodium hydroxide solution, with alkali metal alcoholates or alkali metal phenolates, with ammonia, primary or secondary amines, by the hydroxyl group, or by an ether group or by an amino group; if they contain alcoholic or phenolic hydroxyl groups, these can be esterified or etherified.

The compounds of Formulas IV or V containing acyloxy groups as substituents of the benzene ring A in mand/or p-position to the bond of the triazine ring are produced advantageously, for example, by acylation of the corresponding hydroxyl compounds. Suitable acyl ating agents for this purpose are the carboxylic acid anhydrides and, especially, the halides of carboxylic acids, and of carbonic acid monoesters, i.e. for exam ple, acetic acid anhydride, acetyl chloride, benzoyl chloride, and chloroforrnic acid alkyl esters. Ketenes can also be used as acylating agents. The dihydroxy phenyl triazines here needed as starting materials are obtained by the method described above from compounds of Formula Ill in which A is further substituted by at least one hydroxyl group. Compounds of Formula 1V, in which X and/or Y represent an alkenyl radical are produced advantageously from the corresponding compounds in which X and/or Y is a halogenoalkyl, hydroxyalkyl, alkoxyalkyl or aminoalkyl radical, by removal of hydrohalic acid or splitting off of water or alcohol or amine, possibly after modification into quaternary ammonium salts according to the methods usual in organic chemistry.

Such triazines having unsaturated side chains can also be produced by reacting simple alkyl triazines, particularly methyl triazines, with aldehydes while splitting off water.

Particularly easy to produce are those compounds falling under Formula V which contain two identical alkyl groups of from I to ID carbon atoms as R and R, and hydrogen as R Those containing two identical alkyl groups of from 1 to 10 carbon atoms as R. and R,

and as R: chlorine, alkyl of from 1 to 5 carbon atoms, phenyl, or an acyloxy radical as defined above in connection with Formula V, are almost as easy to produce. These two groups of compounds falling under Formula V, therefore, constitute a preferred subgroup of special value in commercial application.

The new o-hydroxyphenyl-s-triazines according to the invention are distinguished by good fastness to light in polymeric carriers. Compounds according to the invention which contain double bonds in the side chains which are in conjugation with the triazine ring, i.e. those in which either X alone or Y alone or both X and Y are a A -alkenyl or N-aralkenyl group, especially a B-phenylvinyl group, are distinguished by particularly high molar extinction coefficient. At the same time, however, they are somewhat less fast to light than compounds according to the invention which do not contain such conjugated double bonds in the side chains.

The compounds of Formula IV are easily produced in high yields. They are distinguished from known compounds of similar structure and of comparable solubility and light fastness by a less yellow inherent color, while they are distinguished from known compounds of a comparable degree of colorlessness by better solubility in organic solvents and in polymers. This is important in two respects: one important purpose of using the UV absorbers is to impede or at least retard the photochemical discoloration, particularly of substrates which are required to be practically colorless, such as, e.g. polystyrene used in electrical light fixtures.

Such colorless polystyrenes comprise normal crystal grade polystyrene as well as polystyrene modified to possess increased impact strength and/or shatter resistance, as used, for instance, for non-breakable glassware.

Furthermore, the compounds of Formula IV are useful as additives to polymethyl methacrylate, which is inherently colorless, in the production of light filters such as used as window panes for instance in vista dome cars, in automobiles and in airplanes. Naturally, UV-absorbers which are inherently of yellowish color cannot be used in such materials of which practical colorlessness is required.

In addition, the better solubility of the UV-absorber according to the invention, as compared with known UV-absorbers of similarly low inherent color is of great importance in their application, e.g. in the production of very thin light filters containing a high proportion of UV-absorber which must not bloom out".

The new o-hydroxyphenyl-s'triazines falling under Formula IV are incorporated into the light-sensitive carriers or polymeric carriers for light filters in amounts of 0.01 to 30% by the weight calculated on the weight of the total composition. The amount of triazine to be used depends, among other things, on the thickness of the light filter to be produced. For very thin layers such as, e.g., for lacquer coatings, amounts of l to are preferred, for thick layers such as, e.g., polymethacrylate sheets on the other hand amounts of 0.01 to 1% are preferred,

Organic polymers, both thermoplastic polymers as well as thermosetting polymers are the main carriers for the new o-hydroxyphenyl-s-triazines. This includes completely synthetic polymers as well as natural polymers and also their polymeric derivatives chemically modified without substantially changing the degree of polymerization (D.P.). Of the completely synthetic polymers, mainly pure addition and pure condensation polymers, but also condensation polymers cross-linked by addition polymerization are useful as carriers.

Of the addition polymers which can be employed as carriers for the new UV-absorbers, the following types are preferred:

1. Homopolymers of vinyl and vinylidene monomers and copolymers obtained from mixtures of such monomers which polymers are obtained from such monomers with the aid of radical, ionic or metal-organic polymerization initiators. Examples of such monomers, the polymers of which are suitable carriers, are:

a. Polymerizable ethylenically unsaturated halogenated hydrocarbon compounds, in particular vinyl chloride, vinyl fluoride and vinylidene chloride,

b. Polymerizable hydrocarbons having a double bond capable of addition, particularly styrene, isobutylene, ethylene and propylene. Both the atactic and the isotactic forms of polymers can be used.

(c) a,B-unsaturated polymerizable carboxylic acids of preferably 3 to 5 carbon atoms such as acrylic acid and methacrylic acid and such functional derivatives of these acids, as, for instance, the nitriles, amides, N-lower alkyl-amides, N,N-di-(lower alkyl- )amides, N-(hydroxy-lower alkyl)-acylamides, and alkyl esters, particularly lower alkyl esters, in particular acrylonitrile, acrylamide, methacrylamide, methylolacrylamide, the methyl, ethyl, propyl and butyl esters of methacrylic acid and acrylic acid,

d. Polymerizable acyl derivatives of ethylenically unsaturated alcohols and amines of the vinyl alcohol, allyl alcohol or allyl amine type, particularly those of organic carboxylic acids among which are alkanoic and alkenoic acids having up to l8 carbon atoms such as acetic acid, propionic acid, acrylic acid, lauric acid, oleic acid, stearic acid and of aromatic mononuclear carbocyclic carboxylic acids such as benzoic acid and phthalic acid, and also a cyclic carbonic acid imides such as, e.g. those of cyanuric acid, can be used. Examples are allyl phthalate, polyallyl melamines, vinyl acetate, vinyl stearate, vinyl benzoate and vinyl maleate,

e. Polymerizable polyenes with conjugated double bonds such as butadiene, isoprene, chloroprene, sorbic acid and the esters thereof.

2. Homoand co-polymers of epoxides, particularly of bis-epoxides, formed by curing with acid or basic catalysts. Examples of this class are the polymers of hisglycidyl ethers of geminal bis-(p-hydroxyphenyhalkanes and cycloalkanes such as, for instance, the bisepoxide of the formula 3 ca -cH-c'H 0 c OCH -CH-CH l which is the reaction product of Bisphenol A with epichlorhydrin.

3. Homo and co-polymers of lactams and lactones, in particular polymers of e-caprolactam.

4. Homoand co-polymers of aldehydes, particularly of formaldehyde and acetaldehyde, such as polyoxymethylene and polyoxyethylene.

5. Reaction products of isocyanates with hydroxyl and/or amino compounds, in particular those of dior polyisocyanates with divalent or polyvalent hydroxyl and amino compounds. Polyurethanes and polyureas produced by reaction of diisocyanates with polyesters and/or polyethers containing hydroxyl groups are in this class.

The condensation polymers used as carriers for the new o-hydroxyphenyl-s-triazines according to this aspect of the invention are, among others, polyesters and polyamides. Particularly mentioned are linear thermoplastic polycondensates derived on the one hand from dicarboxylic acids and organic dihydroxy derivatives or organic diamines and, on the other, from hydroxy or amino carboxylic acids. Preferred linear polycondensates are the fiber-forming polymers from w,w'-dicarboxylic acids and w,w'-dihydroxy compounds or w,m'-diamines as well as of w-hydroxycarboxylic acids or w-aminocarboxylic acids, in particular those polymers derived from saturated aliphatic, cycloaliphatic and carbocyclic mono-nuclear and non-fused dinuclear aromatic carboxylic acids.

The linear condensation products of the following components are specially suited: adipic acid/hexamethylenediamine; sebacic acid/hexamethylenediamine; terephthalic acid/ethylene glycol; terephthalic acid/l,- 4-dimethylol-cyclohexane; l l-aminoundecanoic acid.

Thermosetting cross-linked polycondensates which are formed in particular by condensation of aldehydes with compounds poly-condensable therewith, in particular, formaldehyde condensates with phenols, ureas and melamines can also be light-stabilized with compounds according to the invention or used as carriers therefor.

Among the condensation polymers subsequently cross-linked by addition polymerization which are suitable for use as carriers for the compounds according to the invention, mainly the polyester resins are of interest. These are copolymers of (a) polyesters of unsaturated carboxylic acids and polyvalent, particularly divalent, alcohols, which polyesters contain polymerizable double bonds and (b) vinyland vinylidenemonomers such as styrene and/or methyl methacrylate. Preferably such copolymerizable polyesters are condensates of maleic acid, itaconic acid, citraconic acid, with divalent alcohols, of which the ones derived from ethylene oxide and propylene oxide such as ethylene glycol, propylene glycol and diethylene glycol and the like are preferred due to their commercial availability. The properties of such polyesters may be modified by replacement of part of the above mentioned unsaturated acids by other aliphatic, cycloaliphatic or aromatic dicarboxylic acids or their anhydrides, such as adipic acid, phthalic anhydride or succinic anhydride. Of particular interest are chlorineand brominesubstituted acids and anhydrides such as tetrachlorophthalic anhydride and the anhydride of l,2,3,4,7,7- Hexachlorobicyclo [2,2,l]-heptene-(2)-5,6- dicarboxylic acid since they lead to self-extinguishing polyester resins.

In a preferred method, this monomer mixture of unsaturated polyesters and vinyl and/or vinylidene monomers (often termed liquid polyester resin) is crosslinked by radical polymerisation initiators.

The natural polymers used as carriers for the new o-hydroxyphenyl-s-triazines are mainly polysaccharides such as cellulose, or also rubber and proteins.

Other polymers useful as carrier for the new compounds according to this aspect of the invention are modifications of natural or synthetic polymers, which modified polymers are obtained by subjecting said parent polymers to chemical reactions such as saponification, hydrolysis, esterification inclusive of transesterification, amidation inclusive of transamidation and/or acetalization, without, however, substantially altering the degree of polymerization of the polymers. Examples of such modifications obtained by the above mentioned or similar polymerhomologous" reactions, i.e, reactions which alter the chemical nature of a polymer without substantially changing the degree of polymerization of the same, are polyvinyl alcohol, obtained by hydrolysis of polyvinylacetate, polyvinyl butyral. obtained by acetalization of polyvinylalcohol with butyraldehyde, cellulose esters of alcanoic acids and/or benzoic acid, obtained by esterification of cellulose with said acids, whereby l to 3 acyl groups per glucose units are introduced into the polymer, or cellulose ethers obtained by etherification of cellulose.

In the compositions according to the invention, the above-enumerated polymers, either alone or in mixture with each other serve as carriers for the new UV absorbers. Particularly valuable compositions according to the invention contain thermoplastic vinyl and vinylidene polymers, inclusive of polyolefins, cellulose esters and ethers, linear, fiber-formin g polyesters, polyamides and polyurethanes, polyester resins, as carriers for the new UV absorbers.

in addition to these polymeric carriers, natural and also synthetic light-sensitive waxes, fats and oils, as well as light-sensitive materials of a more complex nature such as photographic materials, or emulsions which contain light-sensitive fats, or emulsions or dispersions of the polymers above mentioned can be used as carriers for the new UV absorbers according to the invention.

in this connection carrier is meant to embrace a. light sensitive substrates which are improved in their light resistance by incorporation of the new light stabilizers according to the invention,

b. substantially light stable substrates which serve as mechanical bearers of the light stabilizers according to the invention and which compositions of carrier and light stabilizer can be used in the manufacture of UV-light filters.

The molecular weight of the above-described polymers is of secondary importance as long as it is within the margins necessary for the characteristic mechanical properties required of these polymers. Depending on the polymers, it can be between 1000 and several mil lions. The incorporation of the new o-hydroxyphenyl-striazines into these polymers is performed, depending on the type of polymers, by working in at least one of these compounds and optionally other additives such as, e.g. plasticisers, antioxidants, other UV absorbers, heat stabilizers, pigments or the like, into the polymer melt by methods conventional in the industry before or during molding, or by dissolving the UV absorbers according to the invention in the corresponding monomers before polymerization, or by dissolving the polymers and the additives in solvents and thereafter evaporating the latter. The new o-hydroxyphenyl-s-triazines can also be drawn from baths, e.g. from aqueous dispersions, onto films or threads of carrier material.

Q, OH

wherein each of R, and R represents amino-alkyl or hydroxyalkyl, of l to 12 carbon atoms, respectively,

or N-alkylaminoalkyl wherein the alkylamino moiety has from 1 to 8 carbon atoms and the alkyl moiety has from l to 12 carbon atoms,

or alkoxy-carbonyl-alkyl wherein the alkoxy moiety has from 1 to 8, and the alkyl moiety from 1 to 12 carbon atoms,

or carboxy-alkyl with a total of from 2 to 13 carbon atoms, and

R has the meaning given hereinbefore, into a melt of linear fiber-forming polyesters and/or polyamides or into polymerization mixtures containing the monomers from which the aforesaid polyesters or polyamides are produced, at temperatures of 200 to 300C.

On the other hand. s-triazines according to the invention which contain a double bond capable of addition in R,, R and/or in the substituent R of Formula V, and which are present in the mixture of monomers prior to the polymerization of these monomers to the corresponding polymeric carriers, can be built into the polymer chains being formed during polymerization of said vinyl and vinylidene monomers.

The light-sensitive materials can also be protected from the injurious effect of light by painting them with a protective coating, e.g. a lacquer, containing UV absorber falling under Formula IV, or by covering them with covers containing such UV absorbers such as films, discs or plates. In these types of application the amount of UV light absorber added is advantageously 10 to 30%, calculated on the weight of the covering material, for layers of less than 0.01 mm thickness and l to l% for layers of 0.01 to 0.1 mm thickness.

For certain uses, particularly when warm polymer chips are to be powdered with UV absorbers, products which melt above the fusion temperature of the polymer and at the same time are sufficiently soluble in the polymer melt, are particularly valuable.

The following examples illustrate the invention. The temperatures are given therein in degrees Centrigrade. g strands for gram and ml for milliliter. All percentages are by weight unless expressly stated otherwise.

EXAMPLE 1 6 g of dry sodium methylate are dissolved in ml of anhydrous ethyl alcohol and then 10.5 g of acetamidine hydrochloride are added in portions to the solution. The solution of the free acetamidine so obtained, from which sodium chloride crystallizes out, is stirred for 1 hour at room temperature. I L5 g of 2-hydroxy-5- methylbenzoic acid phenyl ester are added and the mixture obtained is then refluxed for 6 hours. The reaction mixture is cooled and then water is added dropwise until, on the one hand the sodium chloride has dissolved and, on the other, the 2-(2'-hydroxy-5'- methylphenyl)-4,6-dimethyl-s-triazine formed has separated out. On leaving to stand for a considerable time, the product crystallizes. The dried reaction product is dissolved in hot ethylene glycol monomethyl ether and recrystallized by careful addition of water. The recrystallized 2-(2'-hydroxy-5'-methylphenyl)-4,6-dimethyls-triazine melts at l3l.

By replacing in the aforesaid example the Z-hydroxy-S-methyl-benzoic acid phenyl ester by the equivalent amount of 2-hydroxy-5-cyclohexyl-, 2- hydroxy-5-( l ',l ',3',3'-tetramethylbutyl)-, Z-hydroxy- 3,S-dimethyl-, 2-hydroxy-4,S-dimethyl-, 2-hydroxy-5- benzyl-, 2-hydroxy-S-phenyl-, 2-hydroxy-3-(4'- ethylphenyl-, 2-hydroxy-5-( 3 '-chlorophenyl or 2-hydroxy-5(4'-bromophenyl) benzoic acid phenyl ester and otherwise following the same procedure as described in the example above, the following compounds are obtained:

2-(2'-hydroxy-5'-cyclohexylphenyl)-4,6-dimethyl-striazine,

tetramethylbutylphenyl)-4,6-dimethyl-s-triazine,

2-( 2 -hydroxy-3 ,5 '-dimethylphenyl)-4,6-dimethyl-striazine,

2-( 2 -hydroxy-4' ,5 '-dimethylphenyl)-4 ,6-dimethyl-striazine,

2-( 2 '-hydroxy-5 '-benzylphenyl)-4,6-dimethyl-striazine, 2-(2'-hydroxy-5'-phenylphenyl)-4,6-dimethyl-striazine,

2-(2 -hydroxy-3 '-p-ethylphenylphenyl)-4 ,tS-dimethyl-s-triazine,

2-( 2 '-hydroxy-5 '-m-chlorophenylphenyl )-4,6-

dimethyl-s-triazine,

2-( 2 -hydroxy-5 '-p-bromophenylphenyl )-4,6-

dimethyl-s-triazine.

EXAMPLE 2 2-hydroxy-5-chlorobenzoic acid-4- chlorophenylester,

2-hydroxy-5-chlorobenzoic acid-3'methylphenyl ester,

2-hydroxy-5-chlorobenzoic acid benzyl ester.

EXAMPLE 3 2.3 g of metallic sodium are converted in 100 ml of anhydrous isopropanol into the sodium isopropylate, 9.5 g of acetamidine hydrochloride are added and then the mixture is reacted as described in example I with 10.5 g of Z-hydroxybenzoic acid phenyl ester. After recrystallization, the 2-(2'-hydroxyphenyl)-4,6-dirnethyls-triazine so obtained melts at 133.

By replacing in the aforesaid example the 2- hydroxybenzoic acid phenyl ester by the equivalent amount of 2-hydroxy-5-tert. buty1-, 2-hydroxy-3,5- dichloro-, 2-hydroxy-3-bromo-5-methyl-. 2-hydroxy-3-allyl-5-methy1-, 2-hydroxy-3-octen-2'-yl-, 2-hydroxy-5-(4'-methyl-cyclohexyl)-, 2-hydroxy-5- phenylethyl-, Z-hydroxy-S-p-ethyl-benzyl-, 2-hydroxy-5-p-bromobenzylor 2-hydroxy-5-mchlorophenylethylbenzoic acid phenyl ester and otherwise following the procedure described in the example, the following compounds are obtained:

2-( 2-hydroxy-5 '-tert. butylphenyl )-4,6-dimethyl-striazine, 2-(2'-hydroxy-3',5'-dichlorophenyl)-4,6-dimethyl-striazine,

2-( 2-hydroxy-3 '-bromo-5 -methylphenyl )-4,6-

dimethyl-s-triazine, 2-(2'-hydroxy-3'-a1lyl-5'-methylphenyl)-4,6-dimethyl-s-triazine, 2-(2'-hydroxy-3-octen2"-ylphenyl)-4,6-dimethyl-striazine, 2-(2-hydroxy-5'-(4"-methyl-cyclohexyl)phenyl)- 4,6-dimethyl-s-triazine,

2-( 2 '-hydroxy-5 -phenylethylphenyl )-4,6-dimethyl-striazine,

2-( 2'-hydroxy-5 '-p-ethyl-benzylphenyl )-4,6-dimethyl-s-triazine,

2-( 2'-hydroxy-5 -p-brom-benzylphenyl)-4,6-dimethyl-s-triazine,

2-( 2 -hydroxy-5 '-m-chlor-phenylethylphenyl)-4.6-

dimethyl-s-triazine.

EXAMPLE 4 24 g of undecylic acid amidine hydrochloride 6 g of sodium methylate and l l g of 2-hydroxybenzoic acid phenyl ester are reacted as described in example I. The 2-(2'-hydroxyphenyl)-4,6-dodecyl-s-triazine so obtained melts at 53.

By replacing in the aforesaid example the undecylic acid amidine hydrochloride by the equivalent amount of propanoic acid amidine hydrochloride, decanoic acid amidine hydrobromide, octadecanoic acid amidine hydrochloride, oleic acid amidine hydrochloride or w-chloroundecanoic acid amidine hydrochloride and otherwise following the procedure given in the example. the following compounds are obtained:

2-( 2 '-hydroxyphenyl )-4,6-diethyl-s-triazine,

2-(2'-hydroxyphenyl)-4,6-dinonyl-s-triazine,

2-(2-hydroxyphenyl)-4,6-diheptadecyl-s-triazine, 2-(2-hydroxyphenyl)-4,6-diheptadecan-8"-yl-striazine,

14 2-( 2 '-hydroxyphenyl )-4,6-di-( w-chlorodecyl )-striazine.

EXAMPLE 5 14 g of butanoic acid amidine hydrochloride 6.2 g of sodium methylate and l l g of 2- hydroxybenzoic acid phenyl ester are reacted as in example l whereupon 2-(2'-hydroxyphenyl)-4,6-dipropyl-s-triazine is obtained as an oil. On distilling the latter at 0.02 mm pressure, the pure product is obtained which passes over at l30-l35. It melts at l8-20.

By replacing in the aforesaid example the butanoic acid amidine hydrochloride by the equivalent amount of bromoethanoic acid amidine-, pentanoic acid amidine, B-methoxypropanoic acid amidine-, B-methylmercapto-propanoic acid amidine-, B-dimethylaminopropanoic acid amidine-, formic acid amidine-, methoxycarbonyl-ethanoic acid amidine-. S-dodecyloxycarbonyl-valeric acid amidine, carboxyethanoic acid amidine-, w-carboxynonanoic acid amidineor fi-bromo-propanoic acid amidinehydrochlo' ride and otherwise following the procedure given in the example, the following products are obtained:

2-(2'-hydroxyphenyl)-4,6-dibromomethyl-s-triazine, 2-(2 '-hydroxypheny1)4 ,o-dibutyl-s-triazine, 2-(2'-hydroxyphenyl)-4,fi-bis-B-methoxyethyl-striazine, 2-(2'-hydroxyphenyl)-4,6-bis-B-methylmercaptoethyl-s-triazine, 2-(2'-hydroxyphenyl)-4,6-bis-B-dimethylaminoethyls-triazine, 2-( 2 '-hydroxypheny1)-s-triazine 2-(2'-hydroxyphenyl)-4,6-bismcthoxycarbonylmethyl-s-triazine, 2-(2-hydroxyphenyl)-4.6-bis-8- dodecyloxycarbonylbutyl-s-triazine, 2-(2'-hydroxyphenyl)-4,6-bis-carboxymethyl-striazine, 2-( 2 -hydroxyphenyl )-4,fi-bis-w-carboxy-octyl-striazine or 2-(2'-hydroxyphenyl)-4,6-bis-B-bromo-ethyl-striazine. By reacting the last mentioned compound with an ex= cess of potassium hydroxyde in n-butanol, the 2-(2'- hydroxyphenyl)-4,G-bis-vinyl-s-triazine is obtained.

EXAMPLE 6 17 g of cyclohexane carboxylic acid amidine hydrochloride, 5.7 g of sodium methylate and 11 g of 2- hydroxybenzoic acid phenyl ester are reacted as described in example 1. After recrystallization from ethanol, the 2-(2'-hydroxyphenyl)-4,6-dicyclohexyl-striazine obtained melts at 106.

By replacing in the aforesaid example the cyclohexane carboxylic acid amidine hydrochloride by the equivalent amount of 4-methyl-cyclohexane carboxylic acid amidine hydrochloride and otherwise following the procedure given in the example, 2-(2'- hydroxyphenyl )-4,6-di-(4 '-methylcyclohexyl )-striazine is obtained.

EXAMPLE 7 9.5 g of acetamidine hydrochloride, 2.3 g of metallic sodium, I00 ml of n-butanol and 13.6 g of 2-hydroxy-4- acetoxybenzoic acid phenyl ester are reacted under the conditions given in example 3. The 2-(2'-hydroxy-4'- acetoxyphenyl)-4,6-dimethyl-s-triazine obtained melts, after recrystallization from alcohol, at 138.

The same product can be obtained more simply as follows:

3 g of 2-(2',4'-dihydroxyphenyl)-4,6-dimethylstriazine (obtained from 2,4-dihydroxybenzoic acid phenyl ester and acetamidine) in ml of acetic acid anhydride are refluxed for half an hour. The cooled reaction mixture is poured into water and the mixture obtained is stirred and cooled until the product crystallizes. After filtering off under suction and recrystallizing from ethanol, the product obtained has the same melting point as the 2-(2'-hydroxy-4'-acetoxyphenyl)- 4,6-dimethyl-s-triazine described above and there is no depression of the melting point when it is mixed with that product.

By replacing in the aforesaid example the acetic acid anhydride by butanoic acid chloride, chloroformic acid methyl ester, chloroformic acid cyclohexylester, lauric acid chloride, maleic acid anhydride or the chlorides of the succinic acid monoethylester, ethyl-( lmethylpropenyl)malonic acid monoethylester, maleic acid monomethylester of sebacic acid monoethylester and following the procedure given in the preceding paragraph, the following products are obtained:

2-(2'-hydroxy-4'-butyroyloxyphenyl)-4,6-dimethyl s-triazine,

2-(2'-hydroxy-4'-methoxycarboxyphenyl)-4,6-

dimethyl-s-triazine, 2-(2'-hydroxy-4'-cyclohexyloxycarboxyphenyl)-4,6-

dirnethyl-s-triazine, 2-(2'-hydroxy-4'-lauroyloxyphenyl)-4,6-dimethyl-striazine, 2'(2'-hydroxy-4'-B-carboxy-acryloyloxy-phenyl)- 4,6-dimethyl-s-triazine, 2-(2'-hydroxy-4'-8-carbethoxy-propionyloxyphenyl)4,6-dimethyl-s-triazine,

2-( 2-hydroxy-4'-a-carbethoxy-a( l '-methylpropenyl)-butyroyloxy-phenyl)-4,6-dimethyl-striazine,

2-(2-hydroxy-4-B-carbomethoxy-acryloyloxyphenyl)-4,6dimethyl-s-triazine or 2-(2'hydroxy-4'-w-carbomethoxy-pelargonyloxyphenyl)-4,6-dimethyl-s-triazine.

EXAMPLE 8 4.0 g of B-phenyl-B-methyl-acrylic acid amidine hydrochloride (produced according to Pinner), 2.5 g of phenyl salicylate and 1.1 g of sodium methylate are reacted as described in example 1. The 2-(2'- hydroxyphenyl)-4,6-bis-(2"-phenyl-A"' -propenyl)striazine obtained melts at 160 after recrystallization from methyl cellosolve.

By replacing in the aforesaid example the B-phenyl-B-methyl-acrylic acid amidine hydrochloride by an equivalent amount of Bp-chIorQphenyI-B- methylacrylic acid amidine hydrochloride and proceeding otherwise in the same manner as described in said example, the 2-(2'-hydroxyphenyl)-4,6-bis-(2"-pchloro-phenyl-A" -propenyl)-s-triazine is obtained.

EXAMPLE 9 A solution of 5 g of 2-(2-hydroxyphenyl)-4,6- dimethyl-s-triazine and 40 ml of benzaldehyde in 40 ml of methanol is mixed with 20 ml of a l0%-methanolic potassium hydroxide solution and the mixture is left to stand for 2 days. The product which crystallizes out is filtered off under suction, washed with methanol and recrystallized twice from methyl cellosolve. The 2-(2'- hydroxyphenyl)-4,6-bis-B-phenylvinyl-s-triazine so obtained melts at l79.

EXAMPLE l0 By replacing the benzaldehyde used in example 9 by an equimolar amount of m-methylbenzaldehyde, pbutyl-benzaldehyde, o-bromobenzaldehyde or methoxybenzaldehyde and proceeding otherwise in the same manner as described in said example, the

2-( 2 '-hydroxyphenyl )-4,6-bis-B-( 3 '-methylphenyl vinyl-s-triazine, 2(2'-hydroxyphenyl)-4,6-bis-B-(4"-butylphenyl)- vinyl-s-triazine, 2-(2'-hydroxyphenyl)-4,6-bis-B-(2"-bromophenyl)- vinyl-s-triazine or 2-( 2 -hydroxyphenyl)-4 ,6-bis-B-( 3 '-ethoxyphenyl)- vinyl-s-triazine is obtained.

EXAMPLE l l 5 g of the s-triazine mentioned in example 9 in ml of dioxan are hydrogenated, using 3 g of Raney nickel as catalyst, at room temperature and atmospheric pressure until no more hydrogen is taken up. The catalyst is removed from the solution by filtration and the filtrate is concentrated in vacuo. The distillation residue is recrystallized twice from alcohol whereupon 2-(2'- hydroxyphenyl)-4,6-bis-B-phenylethyl-s-triazine is obtained as a white powder, MP. 8l82. The same product is also obtained by reacting B-phenylpropionic acid amidine hydrochloride and phenyl salicylate under the conditions given in example 1.

EXAMPLE l2 l4 g of chloroacetamidine hydrochloride, 6 g of sodium methylate and H g of Z-hydroxy-benzoic acid phenyl ester are reacted together as described in example l, whereby 2-( 2 '-hydroxyphenyl)-4,6- dichloromethyl-s-triazine is obtained. By reacting the latter s-triazine with an excess of ammonia, potassium hydroxyde, sodium octylate (C l-i ONa), sodium octyl mercaptide (C H SNa) or hexylamine in acetone,

2-(2'-hydroxyphenyl)-4,6-di-aminomethyl-s-triazine, 2-(2'-hydroxyphenyl)-4,6-di-hydroxymethyl-striazine, 2-( 2 '-hydroxyphenyl)-4,6-di-octyloxymethyl-striazine, 2-(2-hydroxyphenyl)4,6-di-octylthiomethyl-striazine, 2-(2-hydroxyphenyl)-4,fi-di-N-hexylaminomethyl-striazine is obtained.

EXAMPLE 13 33 g of w-bromo undecanoic acid amidine hydrochloride, 6 g of dry sodium methylate and l l g of 2-hydroxy benzoic acid phenylester are reacted together as described in example 1, whereby 2-(2'-hydroxyphenyl)- 4,6-di-w-bromodecyl-s-triazine is obtained. By reacting the latter s-triazine with an excess of ammonia, potas- 1 7 sium hydroxide, sodium ethylate, sodium ethyl mercaptide, methylamine or dibutylamine in acetone,

2-( 2 '-hydroxyphenyl )-4 ,6-di-w-amino-decyl-sl8 chloride by the equivalent amount of oleic acid chloride and otherwise following the procedure described in the example, 2-(2'-hydroxy-4'-oleyloxy-phenyl)-4,6- diethyl-s-triazine is obtained.

triazine, Z-LZfi-Zyiroxyphenyl)-4,6-di-m-hydroxy-decyl-s- 5 EXAMPLE 1 6 2-(2'-hydroxyphenyl)-4,6-di-w-ethoxy-decyl-s- A solution of g of acetyl cellulose having on the triazine, average 2.5 acyloxy groups per glucose unit and 0.3 g 2-(2'-hydroxypheny|)-4,o-di-w-ethylthio-decyl-sof one of the UV absorbers given in the following Table t i i 10 l, 2.0 g of dibutyl phthalate and 82.7 g of acetone are 2-(2'-hydroxyphenyl)-4,6-di-w'methylamino-decylpainted to form a film on a glass plate. The cellulose acs-triazine or etate films obtained, after evaporation of the acetone, 2-(2'-hydroxyphenyl)-4,o-di-w-dibutylamino-decylwhich are dried first at room temperature and then in s-triazine is obtained. an oven at 60, are 0.04 mm thick. Samples of these l5 films are exposed in a fadeometer for I000 hours and EXAMPLE then their brittleness is tested. The results are summa- 2.1 g of 2-(2',4'-dihydroxyphenyl)-4,6-dimethyl-s- 'ised in T ble Table l behavior of film on folding UV before after No. absorber 1000 hours exposure I 2-(2'-hydroxyphenyl)-4,6- can be unchanged dimethyl-s-triazine folded ll 2-( 2'-hydroxy-S'-methyldo do phenyU-Ab-dimethyl-s triazine lll Z-(hydroxyphenyl)-4,6dido do decyl-s-triazine lV 2-(2'-h droxyphenyl)-4.6- do do dicyclo exyl-s-triazine V without UV absorber do breaks triazine, 0.4 g of sodium hydroxide, l g of chloroformic The results given in Table I show that acetyl cellulose acid methyl ester and I0 ml of water are mixed tofilms stabilised according to the invention have considgether at room temperature. After 4 hours, the reaction erably better mechanical properties after exposure mixture is poured on water and the 2-(2'-hydroxythan untreated films. 4'methoxycarbonyloxy-phenyl)-4,6-dimethyl-s-triazine Films made from cellulose triacetate, cellulose triwhich has separated out is collected and recrystallized propionate and cellulose acetobutyrate can be stabifrom hot ethanol. lt melts at I22". lised against the effect of light in the same way.

By replacing in the aforesaid example the chlorofor- 40 mic acid methyl ester by an equivalent amount of the lauryl, cyclohexyl, benzyl or phenyl ester of chloroformic acid or the mono-chloride of sebacic, succinic or ethyl l-methyl-propenyl malonic acid and otherwise following the procedure described in the example,

2-(2'-hydroxy-4'-dodecyloxycarbonyloxy-phenyl)- 4,6-dimethyls-triazine, 2-(2'-hydroxy-4'-cyclohexyloxycarbonyloxyphenyl)-4,6-dimethyl-s-triazine, 2-(2'-hydroxy-4'-benzyloxycarbonyloxyphenyl)- 4,6-dimethyl-s-triazine, 2-(2'-hydroxy-4'-phenoxycarbonyloxy-phenyl)-4,6-

dimethyl-s-triazine, 2-(2'-hydroxy-4'-w-carboxy-pelargonyloxy-phenyl)- 4,6-dimethyl-s-triazine, 2-(2-hydroxy-4-w-carboxy-propionyloxy-phenyl)- 4,6-dimethyl-s-triazine or 2-(2-hydroxy-4'-a-carboxy-a-( l "-methylpropenyl)- butyroyloxy-phenyl)-4,6-dimethyl-s-triazine is obtained.

EXAMPLE 15 2.1 g of 2-(2',4'-dihydroxyphenyl)-4,6-diethyl-striazine, 0.4 g of sodium hydroxide, l g of acryloylchloride and 10 ml of water are reacted together as described in example 14, whereby 2-(2'-hydroxy-4- acryloyloxyphenyl)-4,6-diethyl-s-triazine is obtained.

By replacing in the aforesaid example the acryloyl EXAMPLE l7 Difficultly combustible liquid polyester resin, after the addition of 0.5% by weight of 2-(2'-hydroxy-4' acetoxyphenyl)-4,6-dimethyl-s-triazine, is polymerised with l% by weight of benzoyl peroxide at to form sheets about 2.5 mm thick. Afterwards the sheets are cured at The sheets so produced and exposed show a much less brown colouration than similarly exposed sheets which, however, have been produced without the addition of the additive mentioned above. After an exposure of 500 hours in the fadeometer, the stabilised sheet has a transmission of 83% of light at 500 mp. (transmission before exposure 88%) whilst an unstabilised sheet having the same transmission before exposure, after exposure has a transmission of only 73% of light at 500 mp.

The polyester resin used is produced as follows: A mixture of 343 g of maleic acid anhydride and 428 g of tetrachlorophthalic acid anhydride is added at 80 in portions to a mixture of g of ethylene glycol and 292 g of diethylene glycol. After replacing the air in the reaction vessel by nitrogen, the temperature is raised within 1 hour to l50 and then within 9 hours to 210 and is so maintained for 1 hour. The mass is then cooled to 180", vacuum is applied and the pressure is slowly reduced to l00 mm. These conditions are main- EXAMPLE 18 100 Parts of methacrylic acid methyl ester, 0.2 parts of 2-( 2 '-hydroxy-5 '-chlorophenyl )-4,6-dimethyl-striazine and 0.2 parts of lauroyl peroxide are mixed and polymerised at a temperature of 5070 into sheets of 2 mm thickness.

As can be seen from the following Table, such sheets can be used as colourless UV filters.

Emserwerke AG, Domat-Ems, Switzerland) and 1 part of 2-(2-hydroxyphenyl)-4,6-dipropyl-s-triazine are melted together at 255 in an autoclave having a die in the floor, while excluding air. The melt is pressed by nitrogen pressure through the die.

The homogeneous mass so obtained absorbs UV light and serves for the production of UV dense packing material.

The polymerisation of 100 parts of caprolactam in the presence of 1 part of 2-(2'-hydroxyphenyl)-4,6- dipropyl-s-triazine by the usual methods gives a polymer of similar properties.

If, instead of the polycaprolactam, polyhexamethylene adipamide is used, then a UV dense material is also obtained by the same method.

EXAMPLE 22 Bleached maple veneer is painted with a lacquer of the following composition:

15.0 parts of cellulose acetate CELLlT F 900 of Bayer, Leverkusen, Germany, having about 56% content of acetic acid,

Corresponding results are obtained if, in 2 cm thick sheets, the concentration of UV absorber is reduced to 0.02%.

EXAMPLE 19 A mixture of 660 g of pulverulent emulsion polyvinyl chloride (K value 72, bulk density 0.42), 330 g of dioctyl phthalate and g of 2-(2'-hydroxyphenyl)-4,6-diethyl-s-triazine are worked up on a two-roll mill at 150 into films.

On exposing films so produced, brown spots occur after a 1.5 to 2 times longer period than they occur on similar films produced without the addition of 2-(2'- hydroxyphenyl)-4,o-dibenzyl-s-triazine.

Similar results are obtained if polyvinyl chloride having a K value of 74 and bulk density of 0.46 is used.

The addition of 10 g of barium-cadmium laurate to the mixture described in the first paragraph of this example produces films which are stabilised both to heat and light.

EXAMPLE 20 Polyethylene of medium molecular weight of 28,000 and a density of 0.917 is mixed in a Brabender plastograph with 1% of its total weight of 2-(2- hydroxyphenyl)-4,6dinony1-s-triazine at 180. The mass so obtained is pressed in a platen press at 165 into 1 mm thick sheets.

The sheets obtained have considerably less tendency to brittleness on weathering than those produced without the addition of the triazine derivative mentioned.

Similar results are obtained if, instead of the polyethylene, polypropylene is used but then mixing must be performed at 220 and pressing at 180.

EXAMPLE 21 100 Parts of granulated polycaprolactam (GRILON,

10.0 parts of dimethyl glycol phthalate,

2.25 parts of 2-(2-hydroxyphenyl)-4,6-dipropyl-striazine, (corresponding to 15% by weight calculated on the cellulose acetate),

5.0 parts of methyl alcohol,

10.0 parts of toluene, and

50.0 parts of ethyl acetate.

The natural yellowing of the wood is greatly retarded by this lacquer.

PART ll In a second aspect the present invention concerns a further class of new o-hydroxyphenyl-s-triazines, a process for the production thereof, their use for the stabilizing of certain light-sensitive organic materials and for the production of light filters of higher molecular absorption other than those obtained with the UV absorbers according to the invention described in Part 1, and, as industrial product, the organic materials stabilized with the aid of the new o-hydroxyphenyl-s-triazines as well as light filters containing these triazines.

It has been found that valuable UV absorbers according to the second aspect of the invention are obtained by reacting equimolar amounts of an amidine of the formula and an amidine of the formula NH v-cf (ll) in which formulas X and Y independently of each other represent hydrogen or, an alkyl, alkenyl, cycloalkyl or aralkenyl group, which groups may be substituted with an equimolar amount of an o-hydroxybenzene carboxylic acid ester of the formula (VII) COOR wherein R, represents hydrogen or an alkyl, alkenyl or aralkyl group which may be substituted, and

R represents a hydrocarbon radical which may be substituted, and

the benzene ring A is optionally further substituted in the 3- and 5- positions by alkyl or alkenyl groups each having 1 to ID carbon atoms, and/or by halogen atoms, especially chlorine or bromine, to form a compound of the formula c (VIII) wherein X and Y have the meanings given in formulas (I) and (II), and

R, and A have the meanings given in formula (Vll).

In the formulas 1, ll and VIII, the alkyl groups symbolized by X and Y have, for example, 1 to l8 carbon atoms. Examples are the methyl, ethyl, propyl, isopropyl, butyl, tert. butyl, amyl, hexyl, octyl, decyl, dodecyl, tetradecyl, hexadecyl or octadecyl group; of these, alkyl groups having I to 10 carbon atoms are preferred. The alkyl groups may be further substituted in which case, for example, they may have, among others, the formula -alkylene-E-D,. In this formula, alkylene" represents a divalent aliphatic radical having in particular l to l2, preferably 1 to 4 carbon atoms, and E represents either O or S or N(D Each of D, and D independently represents an alkyl radical preferably containing l to 8 carbon atoms and each also represents hydrogen if E is oxygen or nitrogen. Suitable groups of the formula alkylene-E-D, are, for example, the w-hydroxyalkyl, walkoxyalkyl, w-alkylthioalkyl, m-aminoalkyl groups such as the hydroxymethyl, 2-hydroxyethyl, 2-methoxyethyl, 2- ethoxyethyl, Z-butoxyethyl, 2-methylthioethyl, 2-butylthioethyl, 2-dodecylthioethyl, 2-N,N- dimethylaminoethyl, 2-N,N-diethylaminoethyl or the w-aminodecyl group.

Each of X and Y can also be a halogenoalkyl group preferably containing l to 4 carbon atoms such as the chloromethyl, bromomethyl, 2-chloroethyl or 4- chlorobutyl group. As alkenyl group X or Y represent, e.g. the vinyl group, the A'- or A -propyl or the A- heptadecenyl group, of which the low alkenyl groups having 2 to 6 carbon atoms are preferred. It is possible for the alkenyl groups to be substituted by aryl groups; then they represent e.g. the B-phenylvinyl(=styryl)- group or the B-methyl-B-phenylvinyl group. As cycloalkyl groups, X or Y have 5 to 10, preferably, however, 6 to 7 carbon atoms. Examples are the cyclohexyl, methylcyclohexyl or ethylcyclohexyl group. Compounds in which X is the same as Y are particularly easily produced.

Alkyl groups symbolized by R, in formulas VII and VIII preferably have l to 12 carbon atoms; thus R, is, for example, the methyl, ethyl, propyl, butyl, amyl, hexyl, octyl, decyl or dodecyl group. The alkyl groups may be substituted if desired. Examples of alkyl substituents are halogens such as chlorine or bromine, free or etherified hydroxyl or cyano groups as well as free or modified carboxylic acid ester, but also carboxylic acid amide groups are to be understood; in the latter case, carboxylic acid alkylamide groups, in particular those having a tertiary amide nitrogen atom, are preferred. Cyano and free or modified carboxyl groups can be at any C atom of the alkyl group whilst the halogens and the free or etherified hydroxyl groups are bound to a carbon atom of the alkyl group which is different from the a-carbon atom. Examples of further substituted alkyl groups R, are the 2-chloroor 2-bromoethyl 2 group, l-hydroxyethyl, 4-hydroxybutyl,

methoxyethyl, 2-ethoxyethyl, 2-cyclohexyloxyethyl, Z-cyanoethyl, carboxymethyl, carbomethoxymethyl, carbethoxymethyl, carbodecyloxymethyl or the N,N-dimethylcarbmoylmethyl group. As alkenyl group, R, is in particular the A -propenyl group which can be substituted by low alkyl groups. If R, is an aralkyl group then it contains 7 to 12, preferably 7 to 9, carbon atoms; examples are the benzyl or a methylbenzyl group. R in formula V1] is an alkyl radical, which may be substituted, having 1 to 18, preferably 1 to 6, carbon atoms, e.g. the methyl, ethyl, methoxyethyl, ethoxyethyl, cyanomethyl or a carbalkoxyalkyl radical, particularly the carboxyethoxy, carbethoxy and carbopropoxy ethyl radical. Also, R, represents a cycloalkyl radical having 5 to 10, preferably 6 to 7, carbon atoms, particularly the cyclohexyl radical, or an aralkyl radical having 7 to 12 carbon atoms, mainly the benzyl radical. lt is advantageous, however, if R, is a monocyclic aryl radical having 6 to l2, preferably 6 to 10 carbon atoms, such as the phenyl, a methylphenyl or a halogenophenyl radical.

it has further been found that particularly satisfactory results are obtained with the compounds of the formula 1 R6 H NN A (1x) N R2 R 0 OH wherein each of R, and R represents hydrogen, alkyl of from 1 to 18 carbon atoms, amino-alkyl of l to 12 carbon atoms, hydroxy-alkyl of l to 12 carbon atoms, alkoxy-alkyl wherein the alkoxy moiety has from 1 to 8 carbon atoms and the alkyl moiety has from 1 to 12 carbon atoms,

alkylthio'alkyl wherein the alkylthio moiety has from 1 to 8 carbon atoms and the alkyl moiety has from 1 to 12 carbon atoms,

N-alkylamino-alkyl wherein the alkylamino moiety has from 1 to 8 carbon atoms and the alkyl moiety has from 1 to 12 carbon atoms, or

N,N-di-(alkyl)-amino-alkyl wherein the N-alkyl groups have each from 1 to 8 carbon atoms, and the alkyl moiety bearing the amino group has from 1 to 12 carbon atoms,

alkoxy-carbonyl-alkyl wherein the alkoxy moiety has from 1 to 8, and the alkyl moiety from 1 to 12 carbon atoms, carboxy-alkyl with a total of from 2 to 13 carbon atoms, chloro-alkyl of from 1 to 12 carbon atoms, bromo-alkyl of from I to 12 carbon atoms, cycloalkyl of from 5 to carbon atoms, 5 to 6 of which are ring members, alkenyl of from 2 to 17 carbon atoms, phenylalkenyl of from 8 to 12 carbon atoms, alkyl-phenylalkenyl of from 9 to 12 carbon atoms, alkoxy-phenyl-alkenyl of from 9 to 12 carbon atoms, or chloroor bromo-phenylalkenyl of from 8 to 12 carbon atoms,

R represents hydrogen, alkyl of from 1 to 12 carbon atoms, chloro-alkyl, bromo-alkyl and hydroxyalkyl, each of from 2 to 12 carbon atoms, alkoxy-alkyl of from 1 to 8 carbon atoms in the alkoxy moiety and from 2 to 4 carbon atoms in the alkyl moiety, cyclohexyloxy-alkyl of from 2 to 4 carbon atoms in the alkyl moiety, the heteroatom of the substituent in alkyl in the five last-mentioned members being removed by at least two carbon atoms from the O- bridge in the above formula, cyano-alkyl of from I to 5 carbon atoms, in the alkyl moiety, carboxy-alkyl of from 2 to 6 carbon atoms, alkoxycarbonyl-alkyl of l to 8 carbon atoms in the alkoxy moiety and from 1 to 5 carbon atoms in the alkyl moiety,

N,N-di-(lower alkyl)-carbamyl-alkyl of from 1 to 5 carbon atoms in the last-mentioned alkyl moiety, alkenyl of from 3 to 8 carbon atoms,

phenyl-alkyl of from 7 to 12 carbon atoms, or lower alkyl-phenyl-alkyl of from I to 5 carbon atoms in the last-mentioned alkyl moiety, and

R represents hydrogen, alkyl of from 1 to ID carbon atoms, alkenyl of from 2 to 10 carbon atoms, chlorine or bromine.

The starting materials of formulas I, l1 and VII, some of which are known, can be produced by methods known per se. Amidines of the formulas l or II are obtained, for example, from nitriles of the formulas X-CN or Y-CN by conversion into corresponding iminoethers and reaction of the latter with ammonia; the o-hydroxy-benzene carboxylic acid esters of formula Vll are obtained, for example, from the corre sponding salicyclic acids by esterification. The salicylic acids are advantageously obtained by reacting the phe- 11015 of the formula with carbon dioxide according to Kolbe whereby groups R, which are not hydrogen can be introduced before or after performing the Kolbe synthesis.

The reaction to form the o-hydroxyphenyl triazines is performed by heating the starting materials I, [I and V1], preferably in about molar ratios. Advantageously, the reaction is performed in boiling organic solvents, particularly, when amidines having a high melting point are used. Suitable solvents are mainly alcohols such as methanol, ethanol, ethylene glycol monomethyl or monoethyl ether, or also dioxan.

If desired, any reactive substituents present in the new o-hydroxyphenyl-s-triazines can subsequently be altered. For example, if X or Y in formula VIII is an alkoxyalkyl group then this can be converted with hydrobromic acid into the corresponding bromoalkyl group. o-Hydroxyphenyl-s-triazines having halogenoalkyl side groups are produced advantageously by this method. Exchangeable halogen can also be replaced by reaction with aqueous sodium hydroxide solution, with alkali alcoholates or alkali phenolates, with ammonia, primary or secondary amines, by the hydroxyl group or by an ether group or by an amino group; if the o-hydroxyphenyl-s-triazines contain alcoholic or phenolic hydroxyl groups, these can be esterified or etherified.

In particular, the o-hydroxyphenyl-s-triazines in which R is an alkyl, alkenyl or aralkyl group which may be substituted are obtained by etherifying the cor responding triazines having a free hydroxyl group. Suitable etherification agents are esters of strong acids such as hydrochloric, hydrobromic, hydroiodic acid, sulfuric acid or p-toluene sulfonic acid, with the corresponding alkyl, alkenyl or aralkyl alcohols. Compounds of formula VIII, in which X or Y is an alkenyl radical are produced advantageously from corresponding compounds in which X or Y is a halogenoalkyl, hydroxyalkyl, alkoxyalkyl or aminoalkyl radical by removal of halogen hydracid or splitting off of water or alcohol or amine, optionally after modification into quaternary ammonium salts, by the methods usual in organic chemistry. Such triazines having unsaturated side chains can also be produced by reacting simple alkyl triazines, particularly methyl triazines, with aldehydes while splitting off water.

The new o-hydroxyphenyl-s-triazines are distinguished by excellent fastness to light in polymeric carriers and have high molar extinction in the region of 290-350 mu which has a favorable influence on the protective action. Compounds which contain double bonds in the side chains which are in conjugation with the triazine ring, i.e. those in which X and/or Y is/are a Aalkenyl or A-aralkenyl group, particularly a B-phenylvinyl group, are distinguished by particularly high absorption power. In general, however, they are somewhat less fast to light than compounds which do not contain such conjugated double bonds in the side chains. Compared with previously known compounds of similar constitution, with comparable solubility and light fastness the new triazines are distinguished by a less yellow coloration and, with comparable yellow coloration they are distinguished by better solubility in organic solvents and in polymers. This is important in two respects: the use of UV absorbers is to hinder, among other things, the photochemical discoloration, particularly of the colorless substrata such as polystyrene or polymethyl methacrylate. However, if the UV absorber has a yellow color of its own, the substratum to be protected is already discolored from the beginning so that in this connection the action of the UV absorber is illusory; in addition, better solubility with, at the same time, comparable inherent color of the UV absorber is of great importance in their application and in the production of very thin light filters.

Those compounds of formula [X are particularly advantageous in which the sum of the carbon atoms in R R R and R is greater than three but smaller than 25, and within this subclass, compounds of the formula alkyl alkyl alkyl wherein the sum of the carbon atoms of all three alkyl groups ranges from to 25 and the number of carbon atoms of each alkyl does not exceed 18, afford an optimal compromise of solubility of polyolefines, absorptivity and accessibility, while being practically colorless.

The same carrier materials including substrates to be stabilized against deterioration by ultraviolet light can be employed for incorporation of, and/or protected by the light-stabilizing compounds according to this second aspect of the invention as have been enumerated hereinbefore as useful in combination with the compounds according to the first aspect of the invention, taking, however, into account the differences in properties between the two classes of new light stabilizers which are more closely defined by Formulas IV and V, regarding the first aspect, and Formulas Vlll and lX, regarding the second aspect of this invention.

New compositions of light-stabilized polymeric materials in which compounds falling under Formulas Vlll or lX are the light-stabilizing ingredients, are produced in the same manner as described under the first aspect of this invention with regard to the incorporation of compounds falling under Formulas IV and V, supra, into the various carriers, listed under the first aspect of the invention.

Thus, what has been said there about the incorporation of light-stabilizing compounds having reactive groupings into polymer melts or monomer mixtures being polymerized, applies equally to the compounds falling under the second aspect of the invention.

Likewise, protective coatings and covers containing compounds falling under Formulas Vlll and IX as UV- absorbers can be produced and employed in the same general manner as described under the first aspect of the invention.

The compounds of Formula [X can be used in substantially lower concentration than the comparably substituted compounds of Formula [V in order to achieve the same absorption in the range of 330 to 350 The new o-hydroxyphenyl-s-triazines of Formula Vlll are incorporated into the light-sensitive carriers or polymeric carriers for light filters in amounts of 0.0l to 30%. The amount of triazine to be used depends, among other things, on the thickness of the light filter to be produced. For very thin layers, such as for lacquer coatings, amounts of l to 20% are preferred, for thick layers such as in polymethacrylate sheets on the other hand, amounts of 0.01 to 1% are preferred.

The following examples are used to illustrate the second aspect of the invention. The scales used for temperature and magnitudes in these examples and in those illustrating subsequent aspects of this invention, are the same as those used in the examples illustrating Part I.

EXAMPLE 23 9.5 g of acetamidine hydrochloride are added in portions to a solution of 5.5 g of dry sodium methylate in 50 ml of anhydrous ethanol, whereby the former is converted into the free amidine. The suspension of sodium chloride in the acetamidine solution so obtained is stirred for l hour at room temperature. 10.5 g of 2,4- dihydroxybenzoic acid phenyl ester are then added to this suspension and the mixture is refluxed for 8 hours while stirring well. After cooling, water is added to the reaction mixture until the sodium chloride has dissolved and the reaction product has separated out. The 2-(2',4'-dihydroxyphenyl)-4,6-dimethyl-s-triazine so obtained is filtered off under suction, dried and recrystallized from n-butanol. It then melts at 277.

The product described above is also obtained by replacing in the aforesaid example the 2,4 dihydroxybenzoic acid phenyl ester by the corresponding methyl, ethyl, benzyl, cyanomethyl, m-tolyl or pchlorophenyl ester.

EXAMPLE 24 21 g of capric acid amidine hydrochloride (decanoic acid amidine hydrochloride) are added to a solution of 2.5 g of metallic sodium in ml of isopropanol. The suspension of sodium chloride in the amidine solution obtained is then stirred for 1 hour at room temperature and 11.5 g of 2,4-dihydroxybenzoic acid phenyl ester are added. The resultant mixture is heated for 10 hours on a boiling water bath and then poured into water. The 2-(2',4'-dihydroxyphenyl)-4,6-dinonyl-s-triazine which is precipitated is filtered off under suction, dried and recrystallized from a mixture of methanol and water. it then melts at 79".

By replacing in the aforesaid example the capric acid amidine hydrochloride by equimolar amounts of the amidine hydrochlorides of cyclohexyl-methanoic acid, chloro acetic acid, undecanoic acid, w-chloro undecanoic acid, octa-decanoic acid, 3'-methylcyclohexylmethanoic acid or w-bromo propanoic acid and otherwise following the same procedure as described in the example, the following products are obtained:

2-(2,4-dihydroxyphenyl)-4,6-dicyclohexyl-striazine,

27 2-( 2 ,4 '-dihydroxyphenyl)-4,6-dichloromethyl-striazine, 2-(2,4'-dihydroxyphenyl)-4,6-didecyl-s-triazine, 2( 2 ',4'-dihydroxyphenyl)-4,6-di-w-chlorodecyl-striazine, 2-( 2' ,4 -dihydroxyphenyl )-4 ,6-diheptadecyl-striazine, 2-(2',4-dihydroxyphenyl)-4,6-di-3'- methylcyclohexyl-s-triazine or 2-( 2',4'-dihydroxyphenyl)-4,6-di-B-bromoethyl-striazine. By reacting the latter s-triazine with an excess of potassium hydroxyde in n-butanol. 2-(2',4'- dihydroxyphenyl)-4,6-divinyl-s-triazine is obtained.

EXAMPLE 25 I6 g of B-methylmercapto-propionic acid amidine hydrochloride (produced by Pinners method from B-methylmercapto-propionic acid nitrile) are converted with 5.6 g of sodium methylate as described in example 23 into the free amidine and this is condensed with l l.5 g of 2,4'dihydroxybenzoic acid phenyl ester. After recrystallization from ligroin, the 2-( 2',4- dihydroxyphenyl)-4,6-bis(B-methylmercaptoethyl)-striazine so obtained melts at 124.

By replacing in the procedure given in the above example. the B-methylmercapto-propionic acid amidine hydrochloride by equimolar amounts of B-methoxypropionic acid-, B-dimethylaminopropionic acid-, formic acid, m-carboxynonanoic acid- ,m-methoxy-carbonyl nonanoic acid-, oleic acidor carboxyacetamidine hydrochloride, the following compounds are obtained:

2-(2,4'-dihydroxyphenyl)-4,6-bis-(B-methoxyethyl)-s-triazine, 2-(2',4'-dihydroxyphenyl)-4,6-bis(B- dimethylaminoethyl)-s-triazine, 2-(2',4'-dihydroxyphenyl)-s-triazine, 2-(2,4'-dihydroxyphenyl)-4,6-bis-(w-carboxyoctyU- striazine, 2-(2',4'dihydroxyphenyl)4,6-bis-(wmethoxycarbonyloctyl)-s-triazine, 2-(2,4'-dihydroxyphenyl)-4,6-bis-(heptadecen-8"- yl)-s-triazine or 2-(2',4-dihydroxyphenyl)-4,6-bis-(carboxymethyl)- s-triazine, the latter of which, on esterifying with methanol or octanol and hydrochloric acid produces 2-(2,4'-dihydroxyphenyl)-4,6-bis- (methoxycarbonylmethyl)-s-triazine or 2-( 2,4'-dihydroxyphenyl)-4,6-bis- (octoxycarbonylmethyl)-s-triazine.

EXAMPLE 26 14 g of butyric acid amidine hydrochloride, 6.2 g of sodium methylate and 13 g of 2-hydroxy-4- ethoxybenzoic acid phenyl ester are reacted according to example 23. After recrystallization from a mixture of alcohol and water, the 2-(2'-hydroxy-4- ethoxyphenyl)-4,-dipropyl-s-triazine formed melts at 55.

The same product is also obtained on etherification of 2-(2,4-dihydroxyphenyl)-4,6-dipropyl-s-triazine in the following way: 6 g of 2-(2',4'-dihydroxyphenyl)- 4,6-dipropyl-s-triazine (M.P. 1 18, produced analogously to example 23 from butyric acid amidine hydrochloride and 2,4-dihydroxybenzoic acid phenyl ester) are dissolved in a solution of 1.2 g of sodium methylate in 30 ml of n-butanol. 2.4 g of ethyl bromide are added to this solution and the whole is refluxed for 4 hours. Sodium bromide is removed from the reaction mixture by filtration and the latter is diluted with a maximum of methanol and water in a volume ratio of 1:1 until the reaction product separates out. It proves to be identical to the 2-(2'-hydroxy-4'-ethoxyphenyl)-4,6-dipropyl-striazine described above.

By replacing in the aforesaid example the ethyl bromide by the equivalent amount of l,2-di-bromo ethane, 1,2-dichloro ethane, l,l0-dibromo decane, w-bromo decanol, Z-bromo ethanol, w-hexyloxybutyl bromide, 2-phenyl ethylbromide or the mixture of bromides which is obtained by bromination of octen-l with N- bromo succinimide,

2-( 2 '-hydroxy-4-B-bromoethoxyphenyl)-4,6-

dimethyl-s-triazine, 2-(2'-hydroxy-4-B-chloroethoxyphenyl)-4,6-

dimethyl-s-triazine, 2-(2'-hydroxy-4an-bromodecyloxyphenyl)-4,6-

dimethyl-s-triazine, 2-(2'-hydroxy-4'-cu-hydroxydecyloxyphenyl)-4,6-

dimethyl-s-triazine, 2-(2'-hydroxy-4-fi-hydroxyethoxyphenyl)-4,6-

dimethyl-s-triazine, 2-(2'-hydroxy-4'-w-hexyloxybutoxyphenyl)-4,6-

dimethyl-s-triazine, 2-(2-hydroxy-4'-B-phenylethoxyphenyl)-4,6-

dimethyLs-triazine or a mixture of 2-(2'-hydroxy4'-octen-2"-yloxyphenyl)-4,6-

dimethyl-s-triazine and 2-(2'-hydroxy-4'-a-vinyl-hexyloxyphenyl)-4,6-

dimethyl-s-triazine is obtained.

EXAMPLE 27 8 g of 2-(2',4-dihydroxyphenyl)-4,6-dimethyl-striazine, (MP. 277) are added to a mixture of 2.2 g of sodium methylate, 0.5 g of sodium iodide and 60 ml of acetone. After stirring for l0 minutes, 3.2 g of allyl chloride are added and the whole is refluxed for 4 hours. After cooling, water is added to the reaction mixture and it is made weakly acid. The reaction product is filtered off under suction, washed with water, dried and recrystallized from alcohol. The 2-(2'- hydroxy-4'-allyloxyphenyl)-4,fi-dimethyl-s-triazine so obtained melts at By replacing in the aforesaid example the allyl chloride by an equivalent amount of benzyl chloride, methyl iodide, decyl bromide, B-methoxyethyl bromide, p-ethyl benzyl chloride, B-cyclohexyloxy ethyl bromide, B-cyano ethyl bromide, a-bromo capronic acid hexyl ester, a-bromo capronic acid N,N-dimethyl amide or the sodium salt of chloroacetic acid, a-bromo capronic acid or by chloroacetic acid ethyl ester, then 2-(2'-hydroxy-4'-benzyloxyphenyl)-4,6-dimethyl-striazine, 2-(2' hydroxy-4'-methoxyphenyl)-4,6-dimethyl-striazine, 2-(2'-hydroxy-4-decyloxyphenyl)-4,tS-dimethyl-striazine,

2- 2 '-hydroxy-4 -[3-methoxyethoxyphenyl )-4,6-

dimethyl-s-triazine, 2-(2-hydroxy-4'-p-ethylbenzyloxyphenyl)-4,6-

dimethyl-s-triazine, 2-(2'-hydroxy-4'-B-cyclohexyloxyethoxyphenyl)- 4,6-dimethyl-s-triazine,

2-( 2 '-hydroxy-4-B-cyanoetl1oxyphenyl)-4,6-dimethyl-s-triazine,

2-(2'-hydroxy-4-a-hexyloxycarbonylpentoxyphenyl )-4 ,6-dimethyl-striazine,

2-( 2-hydroxy-4'-a-N .N-dimethylcarbamylpentoxyphenyl)-4,G-dimethyl-s-triazine,

2-( 2hydroxy-4'-carboxymethoxyphenyl )-4,6-

dimethyl-s-triazine, 4

2-( 2'-hydroxy-4'-a-carboxypentyloxyphenyl )-4,6-

dimethyl-s-triazine or 2-( 2'-hydroxy-4'-carbethoxymethoxyphenyl)-4,6-

dimethyl-s-triazine is obtained.

EXAMPLE 28 12 g of 2-hydroxy-4-methoxybenzoic acid phenyl ester, 17 g of cyclohexane carboxylic acid amidine hydrochloride and 5.8 g of sodium methylate in I ml of anhydrous ethanol are reacted as described in example 23. 50 ml of water are added to the reaction mixture. the product which crystallizes out is filtered off under suction, well washed with water and, after drying, recrystallized twice from alcohol. The 2-(2'-hydroxy-4'- methoxyphenyl)-4,6bis-cyclohexyl-s-triazine so obtained melts at l28.

By replacing in the aforesaid example the cyclohexane carboxylic acid amidine hydrochloride by the equivalent amount of cinnamic acid amidine hydrochloride, 2-(2'-hydroxy-4'-methoxyphenyl)-4,6-bis-B- phenylvinyl-s-triazine is obtained. This is also obtained by reacting 2-(2'-hydroxy-4'-methoxyphenyl)-4,6- dimethyl-s-triazine with benzaldehyde using methanolic potassium hydroxide solution as condensing agent.

By replacing in the aforesaid example the benzaldehyde by p-ethyl benzaldehyde, m-ethoxy benzaldehyde, o-chloro benzaldehyde or p-bromo benzaldehyde 2- (2'-hydroxy-4'-methoxyphenyl)-4,6-bis-B-pethylphenylvinyl-s-triazine, 2-(2'-hydroxy-4'- methoxyphenyl)-4,fi-bis-B-m-ethoxyphenylvinyl-striazine,

2-(2'-hydroxy-4'-methoxyphenyl)-4,6-bis-B-ochlorophenylvinyl-s-triazine 0r 2-(2'-hydroxy-4-methoxyphenyl)-4,6-bis-B-pbromophenylvinyl-s-triazine is obtained.

EXAMPLE 29 12.9 g of 2-hydroxy-4-ethoxybenzoic acid phenyl ester and 16.8 g of valeric acid amidine hydrochloride are reacted as described in example 24 in a solution of 2.6 g sodium metal in 100 ml of isopropanol. In this way, after recrystallization from methanol/water, 2-(2'- hydroxy-4-ethoxyphenyl)-4,6-dibutyl-s-triazine is obtained. 1t melts at 43.

By replacing in the aforesaid example the Z-hydroxy- 4-ethoxybenzoic acid phenyl ester by the equivalent amount of 2,4-dihydroxy-3-methylbenzoic acid phenyl ester, 2,4-dihydroxy--tert.butylbenzoic acid phenyl ester, 2,4-dihydroxy-5-chlorobenzoic acid phenyl ester,

2,4-dihydroxy-5-bromobenzoic acid phenyl ester or 2,4 dihydroxy-5-allylbenzoic acid phenyl ester,

2-( 2',4-dihydroxy-3 '-methylphenyl)-4,6-dibutyl-striazine, 2-(2,4'-dihydroxy-5-tert.butylphenyl)-4,6-dibutyls-triazine, 2-( 2 ',4-dihydroxy-5 '-chlorophenyl )-4,6-dibutyl-striazine, 2-(2',4'-dihydroxy-5'-bromophenyl)-4.6-dibutyl-striazine or 2-(2',4'-dihydroxy-5'-allylphenyl)-4,6-dibutyl-s' triazine is obtained.

EXAMPLE 3O l4 g of chloroacetamidine hydrochloride, 6 g of sodium methylate and l4 g of 2-hydroxy-4-methoxy benzoic acid phenyl ester are reacted together as described in example 23, whereby 2-(2'-hydroxy-4- methoxyphenyl)-4,6-dichloromethyl-s-triazine is obtained. By reacting the latter s-triazine with an excess of ammonia, potassium hydroxide or hexylamine in methylethyl ketone. 2-( 2 '-hydroxy-4'- methoxyphenyl)-4.6-di-aminomethyl-s-triazine,

2-(2'-hydroxy-4-methoxyphenyl)-4,6-di-hydrox ymethyl-s-triazinee or 2-(2'-hydroxy-4'-methoxyphenyl)-4,6-di-N- hexylaminomethyl-s-triazine is obtained.

EXAMPLE 3| EXAMPLE 32 In contrast to films produced without UV absorbers, cellulose-Z-acetate films containing l.7% of the UV absorbers given in the following Table l (calculated on the dry content of the films) have less mechanical brittleness after exposure. The results after exposure of 1000 hours in the fadeometer are summarised in Table I.

Table l Continued behaviour of films on folding The films mentioned are produced as follows: Films are drawn from a solution of g of acetyl cellulose (on the average 2 of three hydroxy groups of a glucose unit are acetylated), 0.3 g of UV absorber and 2.0

and, at a temperature of 50-70, polymerised into sheets of 2 mm thickness.

As can be seen from the following Table, such sheets can be used as colourless UV filters.

Table 2 transmission of light of UV wavelength at No. absorber 380 mp. 450 mu l. without UV absorber 90 92 2. 2-(2'-hydroxy-4'-ethoxyphenyl)- 4.6-dimethyl-s-triazine l 92 g of dibutyl phthalate in 83 g of acetone in the usual way. The films are dried at room temperature and then at 60 and are then 0.04 mm thick.

EXAMPLE 33 Difficultly combustible liquid polyester resin, after the addition of 0.5% by weight of 2-(2',4- dihydroxyphenyl)-4,o-dimethyl-s-triazine, is polymerised with 1% by weight of benzoyl peroxide at 80 to form sheets about 2.5 mm thick. Afterwards the sheets are cured at 120".

On exposure, the sheets so produced show a much less brown colouration than sheets produced without the addition of the s-triazine derivative mentioned. After an exposure of 500 hours in the fadeometer, the stabilised sheet has a transmission of 84% (500 mp, transmission before exposure 88%). An unstabilised sheet having 88% transmission before exposure transmits only 73% of the light at 500 mu after the same exposure time.

The polyester resin used is produced as follows: A mixture of 343 g of maleic acid anhydride and 428 g of tetrachlorophthalic acid anhydride is added in portions at 80 to a mixture of 170 g of ethylene glycol and 292 g of diethylene glycol. After replacing the air in the reaction vessel by nitrogen, the temperature is raised to 150 within l hour, then raised to 210 within 9 hours, kept at this temperature for 1 hour and then reduced to l80. Vacuum is then applied and the pressure is slowly reduced to 100 mm. These conditions are maintained until the acid number of the reaction mixture has sunk below 50.

100 g of this polyester are mixed with 50 g of styrene and the mixture is polymerised as described above.

Similar results are obtained if, instead of tetrachlorophthalic acid, an equimolecular amount of phthalic acid anhydride is used. In this case, however, the resultant polyester resin is not difficultly combustible.

If, in the above method, the styrene is replaced by methylmethacrylate, sheets are obtained which have a slighter tendency to turn brownish but which are also easier to stabilisev EXAMPLE 34 100 Parts of methacrylic acid methyl ester, 0.2 parts of 2-( 2 '-hydroxy-4 -ethoxyphenyl )-4 ,6-dimethyl-striazine and 0.2 parts of lauroyl peroxide are mixed Corresponding results are obtained if, with 2 cm thick sheets, the concentration of UV absorber is reduced to 0.02%.

EXAMPLE 35 A mixture of 660 g of pulverulent emulsion polyvinyl chloride (K value 72, bulk density 0.43), 330 g of dioctyl phthalate and I0 g of 2-(2',4'-dihydroxyphenyl)- 4,6-di-ethyl-s-triazine is worked up on a two-roll mill at l50 into films.

The exposure time after which brown spots occur on films so produced is 1.5 to 2 times longer than that of films which are produced without the addition of 2 (2',4'-dihydroxyphenyl)-4,6-dibenzyl-s-triazine.

Similar results are obtained if polyvinyl chloride having a K value of 74 and a bulk density of 0.46 is used.

The addition of IO g of barium-cadmium laurate to the mixture above mentioned produces films which are stabilised to the effect of both heat and light.

EXAMPLE 36 Polyethylene of medium molecular weight of 28,000 and a density of 0.9l7 is mixed at 180 in a Brabender plastograph with 1% of its total weight of 2-(2- hydroxy-4'-ethoxyphenyl)-4,6-dinonyl-s-triazine. The mass so obtained is pressed in a platen press at into l mm thick sheets.

The sheets so obtained have considerably less tendency to brittleness on weathering than those produced without the addition of the triazine derivative mentioned.

Similar results are obtained if, instead of the polyethylene, polypropylene is used but then mixing must be performed at 220 and pressing at 180.

EXAMPLE 37 100 Parts of granulated polycaprolactam (Grilon, Emserwerk A.G., Domat-Ems Switzerland) and 1 part of 2-(2', 4'-dihydroxyphenyl)-4,6-dipropyl-s-triazine are melted together at 255 in an autoclave having a die in the floor, while excluding air. The melt is pressed by nitrogen pressure through the die.

The homogeneous mass so obtained absorbs UV light and can be used for the production of UV dense packing material.

The polymerisation of 100 parts of caprolactam in the presence of 1 part 2-(2',4'-dihydroxyphenyl)-4,6- dipropyl-s-triazine by the usual methods gives a polymer of similar properties.

UV dense material is also obtained if, instead of the polycaprolactam, polyhexamethylene adipamide is used.

EXAMPLE 38 Bleached maple veneer is painted with a lacquer for wood of the following composition: l5.0 parts of Cellit F 900 (of Bayer, Leverkusen, Germany) (about 56% acetic acid content), 10.0 parts of dimethyl glycol phthalate, 2.25 parts of 2-(2-hydroxy-4'- ethoxyphenyl)-4,6-dipropyl-s-triazine (corresponding to by weight calculated on the acetyl cellulose), 5.0 parts of methyl alcohol, 10.0 parts of toluene and 50.0 parts of ethyl acetate. The natural yellowing of the wood is greatly retarded by this lacquer.

PART III In a third aspect the present invention concerns a third class of new o-hydroxyphenyl-s-triazines of some what more gradual slope of the absorption maximum than the compounds described in the preceding parts of this specification, a novel process for the production of said new triazines, their use for the stabilization of certain light-sensitive organic materials, and for the production of light filters of improved constancy of light transmission, due to better inherent light fastness than the compounds according to Parts I and ll of this invention, and of improved compatibility with polymeric substrata as compared with that of known compounds of related structure, also, as industrial products, the organic material stabilised with the aid of these triazines, as well as light filters which contain the new o-hydroxyphenyl-s-triazines.

It has been found that valuable UV absorbers are obtained by reacting substantially equimolar amounts of an oxazine compound of the formula if H wherein X represents an alkyl, alkenyl, cycloalkyl or aralkenyl group, all of which groups may be substituted and of an amidine of the formula (Xll) u (XIII) wherein Y has the aforesaid meaning, and of a compound of the formula wherein X represents hydrogen, an alkyl, alkenyl, cycloalkyl or aralkenyl radical which radicals may be substituted, to form a triazine compound of the formula (XIV) wherein X and Y have the aforesaid meaning, Y being of the formula and wherein R represents hydrogen, halogen or an alkyl, aralkyl or an alkoxy or acyloxy group, and the benzene rings A and B can be further substituted in each of the 3-, 4- and S-positions by alkyl, alkenyl, cycloalkyl, aralkyl, aryl groups, by free, etherified or acylated hydroxyl groups and by halogens, and if desired, subsequently chemically modifying other reactive substituents present.

R in Formula XV represents the following:

a. halogen, preferably chlorine or bromine b. alkyl groups which have advantageously l to 8 carbon atoms, such as the methyl, ethyl, butyl, or tert. octyl group alkyl groups having 1 to 4 carbon atoms being preferred,

c. aralkyl groups of preferably 7 to 12 carbon atoms,

for example, the benzyl, a methylbenzyl, a chlorobenzyl or the o-amylbenzyl group, aralkyl groups having 7 to 9 carbon atoms being preferred;

d. alkoxy groups symbolized by R, have 1 to 8 carbon atoms.

Examples are the methoxy, ethoxy, butoxy or octyloxy group. Of these, alkoxy groups having I to 4 carbon atoms are preferred.

Acyloxy groups symbolized by R, correspond in particular to the formula UCOO, in which U is hydro gen, an alkyl radical having 1 to 8 carbon atoms, a phenyl radical which may be substituted by low alkyl groups, low alkoxy groups or by chlorine or bromine, or an alkoxy group having 1 to 10 carbon atoms. The acyl radical or these acyloxy groups is thus, for example, the formyl, acetyl, propionyl, butyryl, capronyl, hexanoyl, benzoyl, o'chlorobenzoyl, p methoxybenzoyl, m-methylbenzoyl, methoxycarbonyl or decyloxycarbonyl group. These acyl radicals preferably contain 1 to 6 carbon atoms.

Alkyl groups symbolized by X in the formulas l and XIV and X in formula (XI) have, I to 18 carbon atoms. Examples are the methyl, ethyl, propyl, isopropyl, butyl, tert. butyl, amyl, hexyl, octyl, decyl, dodecyl, tetradecyl, hexadecyl or octadecyl group; of these, alkyl groups having 1 to 10 carbon atoms are preferred. The alkyl groups may be further substituted if desired. Substituted alkyl groups correspond, among others, to

the formula -alkylene-E-D, for example. In this formula, alkylene represents a divalent aliphatic radical having in particular I to 12, preferably 1 to 4 carbon atoms, and E represents either O- or S- or N(D,). D, and D independently of each other represent an alkyl radical containing preferably 1 to 8 carbon atoms, and if E is oxygen or nitrogen D, or D can also be hydrogen. Suitable groups of the formula -alkylene-E-D are, for example, the w-hydroxy-alkyl, w-alkylmercaptoalkyl, m-aminoalkyl groups, that is, e.g. that hydroxymethyl, 2-hydroxyethyl. 2- methoxyethyl, 2-ethoxyethyl, 2-butoxyethyl, Z-methylmercaptoethyl, Z-butyImercaptoethyl, 2-dodecylmercaptoethyl, 2-N,N-dimethylaminoethyl or 2-N,N'diethylamonoethyl or the w-aminodecyl group. Each of X or X can also be 2 halogenoalkyl group having preferably lto 4 carbon atoms such as the chloromethyl, bromoethyl, 2-chloroethyl or 4- chlorobutyl group. As alkenyl groups, X and X represent for example the vinyl group, the A- or A -propenyl or A -heptadecenyl group; of these low alkenyl groups having 2 to 6 carbon atoms are preferred. It is possible for the alkenyl groups to be substituted by aryl groups. They can then represent e.g. the B-phenylvinyl (styryl group) or the B-phenyl-B-methyl-vinyl group. If X or X represents such an aralkenyl group, then this contains 8 to 12 carbon atoms. As cycloalkyl groups, X and X contain 5 to 10, preferably however, 6 to 7 carbon atoms. Examples are the cyclohexyl, methylcyclohexyl or ethylcyclohexyl group.

The benzene rings can be further substituted as defined. The alkyl groups which can be substituents of the benzene rings have 1 to l8, preferably 1 to carbon atoms, alkenyl groups as ring substituents have 2 to 18, preferably 2 to 5 carbon atoms; such substituents are thus, e.g. the methyl, tert. butyl or tert. octyl group or the allyl or methallyl group. Cycloalkyl or aralkyl groups as substituents of the benzene rings advantageously are those having 5 to 8 and 7 to 10 carbon atoms respectively, e.g. the cyclohexyl group and the benzyl or l-phenylethyl group respectively. Aryl groups used as benzene ring substituents are, in particular, of the benzene series and have 6 to 10 carbon atoms. Examples are the phenyl, a methylphenyl, chlo rophenyl or methoxyphenyl group. If the benzene rings contain acylated hydroxyl groups, then the acyl radical thereof is derived in particular from an aliphatic carboxylic acid having at most one carbon-carbon double bond and having I to 18, preferably 1 to ID carbon atoms, whereby the carboxylic acid radical can be substituted, in particular by carboxyl, carbo-low alkoxy or low alkoxy groups. The acyl radical can also be derived from a cycloaliphatic carboxylic acid having 6 to 8 carbon atoms or from an araliphatic carboxylic acid having 8 to 10 carbon atoms or from an aromatic carboxylic acid, in the latter case particularly from a carboxylic acid of the benzene series having 7 to I] carbon atoms. The acyl radical can also consist of a carbonic acid monoester radical having 2 to 11 carbon atoms. Example of acyl radicals in acyloxy substituents of the benzene rings are the radical of acetic, propionic, stearic, acrylic, crotonic, B-carboxypropionic, B-carbo-methoxypropionic, B-carboethoxypropionic, B-carbohexyloxypropionic, butoxyacetic, B-methoxypropionic, cyclohexane carboxylic, phenylacetic, cinnamic, benzoic, chlorobenzoic, methylbenzoic, methoxybenzoic, butylbenzoic or o-carboxybenzoic acid or the carbomethoxy, carbethoxy, carbobutoxy, carbodecyloxy, carbocyclohexyloxy, carbobenzyloxy, carbophenyloxy, carbochlorophenyloxy or carbocresyloxy radical.

As etherified hydroxyl groups, the benzene rings contain substituents of the formula R',O-. Herein, R, represents, in particular, an alkyl, alkenyl or aralkyl group which may be substituted. Alkyl groups symbolized by R, have Preferably l to 12 carbon atoms. The alkyl groups may be substituted, examples of substituents being halogens such as chlorine or bromine, free or etherified hydroxyl or cyano groups as well as free or modified carboxyl groups. By modified carboxyl groups" chiefly carboxylic acid ester but also carboxylic acid amide groups are to be understood; in the latter case, carboxylic acid alkylamide groups, in particular those having a tertiary amide nitrogen atom are preferred. cyano and free or modified carboxyl groups can be at any carbon atom of the alkyl group R, whilst the halogens and free of etherified hydroxyl groups are bound to a carbon atom of this alkyl group which is different from the a-carbon atom. Examples of further substituted alkyl groups R, are the 2-chloroethyl, 2- bromoethyl, Z-hydroxyethyl, 4-hydroxybutyl, 2- methoxyethyl, 2-ethoxyethyl, 2-cyclohexyloxyethyl, 2-cyanoethyl, carboxymethyl, carbomethoxymethyl, carbethoxymethyl, carbodecyloxymethyl or the N,N-dimethylcarbamoylmethyl group. As alkenyl group, R represents in particular a A -propenyl group which can be substituted by low alkyl groups, If R, is an aralkyl group, it contains 7 to 12, preferably 7 to 9 carbon atoms; examples are the benzyl or a methylbenzyl group.

Particularly satisfactory all round properties are shown by the substantially non-coloring light stabilizers for organic, particularly organic polymeric materials, according to the invention, which are sufficiently stable to heat up to at least 200C to withstand incorporation at such temperature into such substrata, and which are of the formula C (XVI) i \N c (i R10 R/ wherein R, represents hydrogen, alkyl of from lto 18 carbon atoms, amino-alkyl of l to 12 carbon atoms, hydroxy-alkyl of 1 to 12 carbon atoms, alkoxy-alkyl wherein the alkoxy moiety has from 1 to 8 carbon atoms and the alkyl moiety has from l to 12 carbon atoms, alkylthio-alkyl wherein the alkylthio moiety has from 1 to 8 carbon atoms and the alkyl moiety has from I to 12 carbon atoms,

N-aIkylamino-alkyl wherein the alkylamino moiety has from I to 8 carbon atoms and the alkyl moiety has from I to 12 carbon atoms, or

N,N-di-(aIkyI)-amino-alkyl wherein the N-alkyl groups have each from I to 8 carbon atoms, and the alkyl moiety bearing the amino group has from I to I2 carbon atoms,

alkoxy-carbonyl-alkyl wherein the alkoxy moiety has from I to 8, and the alkyl moiety from 1 to I2 carbon atoms,

carboxy-alkyl with a total of from 2 to 13 carbon atoms,

chIoro-alkyl of from I to I2 carbon atoms,

bromo-alkyl of from I to I2 carbon atoms,

cycloalkyl of from 5 to I carbon atoms, to 6 of which are ring members,

alkenyl of from 2 to I7 carbon atoms,

aIkyI-phenyI-alkenyl of from 9 to 12 carbon atoms,

aIkoxy-phenyl-alkenyl of from 9 to 12 carbon atoms,

chloroor bromophenyl-alkenyl of 8 to 12 carbon atoms,

R, represents hydrogen, chlorine, bromine, alkyl of from I to I8 carbon atoms,

alkenyl of from 2 to I8 carbon atoms, cycloalkyl of from 5 to 8 carbon atoms, 5 to 6 of which are ring members,

phenylalkyl of from 7 to carbon atoms, alkylphenylalkyl of from 8 to It) carbon atoms, chloroor bromo-phenylalkyl of from 7 to 10 carbon atoms, phenyl, aIkyIphenyI of from 7 to I0 carbon atoms, chlorophenyl, bromophenyl, or acyloxy which term is used for one of the following acyloxy radicals: alkanoyloxy of from I to I8 carbon atoms, alkenoyloxy of from 3 to 18 carbon atoms and one double bond,

carboxy-alkanoyloxy of from 4 to I2 carbon atoms,

alkoxy-carbonyI-alkanoyloxy of from 3 to I3 carbon atoms,

carboxy-alkenoyloxy of from 4 to I2 carbon atoms,

alkoxy-carbonyl-alkenoyloxy of from 5 to I13 carbon atoms,

benzoyloxy, alkylbenzoyloxy of from 7 to I0 carbon atoms,

chloroor bromo-benzoyloxy alkoxy-carbonyloxy of from 2 to 13 carbon atoms,

cyclohexyloxycarbonyloxy benzyloxycarbonyloxy, or phenoxycarbonyloxy, or a radical of the formula -OR wherein R represents hydrogen, alkyl of from I to I2 carbon atoms, chloro-alkyl, bromo-alkyl and hydroxyalkyl, each of from 2 to I2 carbon atoms, alkoxy-alkyl of from I to 8 carbon atoms in the alkoxy moiety and from 2 to 4 carbon atoms in the alkyl moiety, cyclohexyloxy-alkyl of from 2 to 4 carbon atoms in the alkyl moiety, the heteroatom of the substituent in alkyl in the five last-mentioned members being removed by at least two carbon atoms from the oxygen atom in OR,-,; cyano-alkyl of from I to 5 carbon atoms, in the alkyl moiety, carboxy-alkyl of from 2 to 6 carbon atoms, aIkoxy-carbonyl-alkyl of I to 8 carbon atoms in the alkoxy moiety and from I to 5 carbon atoms in the alkyl moiety, N,N-di-(Iower aIkyI)-carbamyl-alkyl of from I to 5 carbon atoms in the last-mentioned alkyl moiety, alltenyl of from 3 to 8 carbon atoms, phenyI-alkyl of from 7 to 12 carbon atoms, or lower alkyI-phenyl-alkyl of from I to 5 carbon atoms, in the last-mentioned alkyl moiety;

R represents hydrogen, chlorine, bromine, aIkyI of from I to 8 carbon atoms, phenyl-alkyl of from 7 to l2 carbon atoms, alkyl-phenyl-alkyl of from 8 to I3 carbon atoms, chlorophenylalkyl of from 7 to I2 carbon atoms, alkoxy of from I to 8 carbon atoms, alkanoyloxy of from 1 to 9 carbon atoms, benzoyloxy, lower alkylbenzoyloxy, lower alkoxybenzoyloxy, chlorobenzoyloxy, bromobenzoyloxy', and

R represents hydrogen, alkyl of from I to 10 carbon atoms, aIkenyI of from 2 to 5 carbon atoms, cycloalkyl of from 5 to 8 carbon atoms, 5 to 6 of which are ring members, phenylalkyl of from 7 to I0 carbon atoms, lower-alkylphenyI-lower-alkyl, chlorophenyl-lower al kyl, bromophenyl-lower alkyl, lower alkoxy-phenyllower alkyl, hydroxy, alkoxy of from to 8 carbon atoms, alkanoyloxy of from I to 9 carbon atoms, alkenoyloxy of from 3 to 5 carbon atoms, chlorine or bromine.

Compounds of Formula (XVI) which possess a molecular weight between 248 and about 650 are distinguished by a particularly favorable combination of good absorptivity and solubility. Compounds showing an optimal combination of good absorptivity and solubility properties are those of Formula (XVI) having molecular weight between 260 and 510.

Compounds falling under Formula (XVI) which possess especially satisfactory light-protective power for polyester resins are those of the formula wherein each of R and R independently of each other, represents hydrogen or alkyl or from I to 8 carbon atoms, and alk yl in Formula XVII is an alkyl radical of from I to 12 carbon atoms.

Compounds falling under Formula XVI with particularly good absorptivityto light of wavelengths in the range of from about 330 to 350 mp, substantially independently of the type of organic polymeric substrate, are those of the formula H OH H N QN *u X /B I alkyl (XVIII) 

1. A SUBSTANTIALLY NON-COLORING LIGHT STABILIZER FOR ORGANIC POLYMERIC SUBSTRATA WHICH IS SUFFICIENTLY STABLE TO HEAR UP TO AT LEAST 200*C TO WITHSTAND INCORPORATION AT SUCH TEMPERATURE INTO SAID SUBSTRATA, AND WHICH IS OF THE FORMULA
 2. The compound of the formula
 3. An aryl-1:3:5-triazine of the formula
 4. An aryl-1:3:5-triazine of the formula 